---
updatedAt: 2026-08-05T14:55:47.000Z
agentTools:
  projectIndex: https://developer.zylo.com/llms.txt
---

# Convert a Choice Custom Field to Multichoice

### Required Permissions
`admin`
### Rate Limit
`limited`
> 📘 Important Note
>
> This is a one-way conversion: a field can be converted from `choice` to `multichoice`, but not back. The field must currently be of type `choice`.

# OpenAPI definition

```json
{
  "openapi": "3.0.0",
  "components": {
    "schemas": {
      "UUID": {
        "type": "string",
        "example": "52907745-7672-470e-a803-a2f8feb52944",
        "description": "Stringified UUIDv4.",
        "pattern": "[0-9A-Fa-f]{8}-[0-9A-Fa-f]{4}-4[0-9A-Fa-f]{3}-[89ABab][0-9A-Fa-f]{3}-[0-9A-Fa-f]{12}"
      },
      "DateTime": {
        "type": "string",
        "format": "date-time",
        "description": "Diplays dates as a string in the format \"YYYY-MM-DD HH:MM:SS\"."
      },
      "JsonApiResponse": {
        "properties": {},
        "additionalProperties": {},
        "type": "object"
      },
      "CustomFields": {
        "properties": {
          "custom_field_group_id": {
            "allOf": [
              {
                "$ref": "#/components/schemas/UUID"
              }
            ],
            "nullable": true,
            "description": "The custom field group this field belongs to."
          },
          "description": {
            "type": "string",
            "nullable": true,
            "description": "The custom field description."
          },
          "entity_type": {
            "type": "string",
            "enum": [
              "applications",
              "payments",
              "contracts",
              "users"
            ],
            "description": "The type of entity this custom field applies to (e.g. company_app, contract, charge). Defaults to applications."
          },
          "id": {
            "$ref": "#/components/schemas/UUID",
            "description": "Unique identifier for a custom field."
          },
          "is_enabled": {
            "type": "boolean",
            "nullable": true,
            "description": "Indicates whether the custom field is enabled or not."
          },
          "name": {
            "type": "string",
            "description": "The custom field name."
          },
          "options": {
            "allOf": [
              {
                "$ref": "#/components/schemas/JsonApiResponse"
              }
            ],
            "nullable": true,
            "description": "The options of the custom field."
          },
          "position": {
            "type": "number",
            "format": "double",
            "nullable": true,
            "description": "The position of the custom field."
          },
          "type": {
            "type": "string",
            "enum": [
              "date",
              "text",
              "choice",
              "multichoice",
              "currency",
              "boolean",
              "number",
              "email"
            ],
            "description": "The type of the custom field."
          },
          "zylo_created_at": {
            "allOf": [
              {
                "$ref": "#/components/schemas/DateTime"
              }
            ],
            "nullable": true,
            "description": "Date and time the record was created in Zylo."
          },
          "zylo_created_by": {
            "type": "string",
            "nullable": true,
            "description": "The user or entity that created the custom field."
          },
          "zylo_modified_at": {
            "allOf": [
              {
                "$ref": "#/components/schemas/DateTime"
              }
            ],
            "nullable": true,
            "description": "Date and time the record was last modified in Zylo. Uses the created date by default."
          },
          "zylo_modified_by": {
            "type": "string",
            "nullable": true,
            "description": "The user or entity that last modified the custom field."
          }
        },
        "required": [
          "custom_field_group_id",
          "description",
          "entity_type",
          "id",
          "is_enabled",
          "name",
          "options",
          "position",
          "type",
          "zylo_created_at",
          "zylo_created_by",
          "zylo_modified_at",
          "zylo_modified_by"
        ],
        "type": "object",
        "additionalProperties": true
      }
    },
    "securitySchemes": {
      "apiKey": {
        "type": "http",
        "scheme": "bearer"
      }
    }
  },
  "info": {
    "title": "Resources",
    "version": "2.0.0"
  },
  "paths": {
    "/v2/customFields/{customFieldId}/convertToMultichoice": {
      "post": {
        "operationId": "CustomFieldsController_ConvertCustomFieldToMultichoice",
        "responses": {
          "200": {
            "description": "Ok",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/CustomFields"
                }
              }
            }
          }
        },
        "description": "### Required Permissions\n`admin`\n### Rate Limit\n`limited`\n> 📘 Important Note\n>\n> This is a one-way conversion: a field can be converted from `choice` to `multichoice`, but not back. The field must currently be of type `choice`.",
        "summary": "Convert a Choice Custom Field to Multichoice",
        "tags": [
          "Custom Fields"
        ],
        "security": [
          {
            "apiKey": []
          }
        ],
        "parameters": [
          {
            "in": "path",
            "name": "customFieldId",
            "required": true,
            "schema": {
              "$ref": "#/components/schemas/UUID"
            }
          }
        ],
        "x-proxy-enabled": false
      }
    }
  },
  "servers": [
    {
      "url": "https://api.zylo.com/"
    }
  ],
  "tags": [
    {
      "name": "Custom Fields"
    }
  ]
}
```