Is it an Expense or are you putting Cash into Equity?
If you buy something with your Cash that is an Expense to the company, then just enter in the Expense and take the Cash (Reimbursement).
If you are putting Cash into the Company, then you're putting in Equity. So if you don't have an Equity Acct that's called something like Owner's Investment, then create it. The when you record the Cash deposit put it against the Owner's Investment Acct.