Follow the steps below to copy an existing field in your base model, with the option to edit the new copy before it is created.
Open the Base Model configuration (Administration > Applications > App Designer > Base Model):
Select an existing field (can be non-repeating or part of a field group), then click Copy Field. The Copy Field screen appears, with the source field details filled in (and the Names appended with “copy”):
Make any changes needed to the copied version of the field. Because this is a new field, any of the properties can be edited from the source settings.
Click Save to save the copy of the field as a new field.
After saving, the field appears under either Non-repeating fields or under the Parent Group