From a user:

When I label expenses or income as reimbursement, flag it to map to its income or expense, respectively. For example, I go on a work trip and have a hotel ($100), a meal ($20), and an Uber ride ($30). I label the expenses as reimbursement and I’m triggered to map them to an income reimbursement transaction. Work reimburses me for all three expenses in one check ($150). Say I forget to add the Uber ride as a reimbursement expense, it flags that only $120 of the $150 is listed under reimbursement expenses, so then I go find the Uber to change the category. In the reverse, it says $150 reimbursed income, “select all the expenses that were reimbursed.” Or something similar to this where it flags it if it’s not balanced.