Unfortunately, when you set up an addition and check off the "track by job" box in the set-up, the total cost will be prorated by job based on the percentage of total hours contributed to the jobs in the wages section.  The addition works great if 100% of the time is allocated to a single job....not so great if time is split.

I have several government contractors that also have to track similar items.  I have to manually make a journal entry to move the split costs.  Debit the expense account and include the correct job name and credit the expense account and include the incorrect job name.