When creating a new dimension in Funnel you have the option to make it a copy of any dimension that is present in other Funnel accounts that you have access to. After navigating to the Dimensions page under Data Mapping, start out by clicking on the drop down arrow next to "+ Custom dimension":
You are now presented with two options asking you to choose between "Copy from another account" or "Create from template".
Copy from account
If you have access to several accounts in Funnel you have the possibility to choose a dimension from any of those accounts.
Simply select an account and the dimensions you wish to copy, then click "Create X fields":
Create from template
If you have removed the default custom dimensions and would like to restore them, all you need to do is click on "Create from template" and select your desired dimensions:
Duplicating custom dimensions
If you want to make a copy of a dimension in the same account, simply click on the copy symbol next to the description of the existing dimension:
Congratulations, you're done! Your new dimension and its defined rules are now presented to you. If you want to change the dimensions name, or its rules, you can always edit it by clicking the "Edit" symbol next to the "Copy" symbol.