Managing reimbursement

Just went on a trip paid for by the company’s dime. Had a separate category for the trip where I recorded all transactions so I could make sure everything was reimbursed and recorded correctly. Reimbursement came in as a lump sum; directly assigned it to the category instead of to RTA.

Now, here’s the problem — I want to delete the category and re-assign expenses to their proper categories, because I like knowing what I actually spent money on. But I’m not sure how to do this considering that it’s a lump sum reimbursement.

For example, suppose I spent $100 on eating out and $200 on flights. That would be a total of $300 inflow that originally went to the trip category. If I now re-assign the expenses to their correct categories, how do I inflow the $300 split correctly between them? If I do it through RTA it’s going to have that annoying “spent x of x”.