Truncating Family table instance names

Our company has a drawing number format as follows 123456-instance.
If there are 3 instances on drawing 123456 they are called
123456-001, 123456-002, 123456,003 etc.
The problem arises when I create a 2d repeat region, in the "Instance Name"
cell the full instance name appears "123456-001" I would like just "001", "002"
etc. Is there a way of truncating the instance name?
Hope you can help
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