Create a change order at menu 6-4-1, don't put anything on the Prime details tab, just use the budget details tab.  Enter a credit for the contingency cost code and positive values for whatever codes you want to distribute it to.  I like to create a change order type at the top and call in in-house or budget only.   Something to distinguish between that and regular client change orders.   It does have to be an "approved' status to be reflected on job cost reports.

Create a change order at menu 6-4-1, don't put anything on the Prime details tab, just use the budget details tab.  Enter a credit for the contingency cost code and positive values for whatever codes you want to distribute it to.  I like to create a change order type at the top and call in in-house or budget only.   Something to distinguish between that and regular client change orders.   It does have to be an "approved' status to be reflected on job cost reports.