Yes.  Creating and Customising your own fields is a function available from our Professional Plan and upwards.  You can add fields to a form anywhere within the solution. 

You can give this field whatever name you like and can add as many field as you like to a form.  Whats more, if a form has a Type then each Type can display different fields. So you could have for example, serial number and product field on your warranty type contracts but an internal credit rating field on your commercial type contracts.

For more information on creating your own Custom Fields please click here