Hi @CCL
I'm assuming you're a limited company seems you're looking for a Directors Loan Account? If that's not the case, the process is the same with Sole Trader, except with 'Proprietor Drawings Account'.
The DLO/PDA is a virtual bank account - it doesn't really exist, it's just there for the purposes of making everything tally up:
With out of pocket expenses, you can create a purchase invoice as per usual, and then tag it as paid from the DLO:
Hope that helps!