You may change the Creditor group 1 and / or 2  for selected creditor (supplier / vendor) account(s). 

TurboCASH4 - Creditor context menu - Change groups

To change Creditor group 1 or Creditor group 2: 

1.On the Edit → Creditors (Creditor list screen) select the Creditor (supplier / vendor) accounts, and right-click on Creditor group 1 or Creditor group 2 context-menu. 

If you need to select multiple creditor accounts, press the Ctrl key and click on each creditor account.

2.Select "Empty" or the available Creditor group from the sub-menu. The Creditor group 1 or 2 will change on the reports.