How to add custom fields in Test Plan STWB_2?

Hello Gurus,

I need to add a custom field to identify the transaction name created / customized in SOLAR02 (aba transaction).

Example: GAP_XPTO where the SOLAR02 (tranzação tab) is "Z" transaction was created. When I create the plan / package test "Z" transaction is aparencendo, but must also appear on behalf of GAP (GAP_XPTO). This custom field should appear later in t-code STWB_WORK

Thanks & best regds,