I am trying to edit grails scaffolding template to create individual fields in create.gsp and edit.gsp
If I add following in create.gsp
<%
                
        With scaffolding plugin in grails 3.x, it's not possible to do what you are trying to achieve. While generating templates for domains, scaffolding plugin doesn't load any of the domain class or you can say it doesn't load the grails application.
Scaffolding plugin uses scripts generated by create-script to generate templates. 
In Grails 3.x it is not possible to load a Grails application within a code generation script created by the
create-scriptcommand.
For more info, read this link.
So you have two options:
create-command as explained in link given above.FormFieldsTagLib to define a custom behaviour for <f:all bean=""/> tag.