Use $ref exclude properties

We have a Simple Model like:

schemas:
    UserModel:
      properties:
        customerId:
          type: string 
          example: K123S
        email:
          type: string
          format: email
          example: test@test.de
        title:
          type: string
          example: Herr
        firstName:
          type: string
          example: Weihnachts
        lastName:
          type: string
          example: Mann
        birthday:
          type: string
          format: date
          example: 24.12.1999
        phone:
          type: string
          format: phone
          example: +49 151 12423435

And now i want a requestBody without the customerId field.

components:
  requestBodies:
      UserCreateBody:
        description: Create a User
        required: true
        content:
          application/json:
            schema:
              properties:
                password:
                  type: string
              allOf:
                - $ref: '#/components/schemas/UserModel'  
              
              

How can i exclude the customerId?