I have set up an account called Personal Credit Card to record expenses paid for on my personal card. How do I show payments to reimburse me for this expenditure?

Hello and welcome to the Community, james-tye-hammer 

You can record the reimbursement by creating a transfer or expense (+ New > Expense) with the bank account used to repay selected under Payment account, and the Personal CC account entered in the Category field on the Category details line (with all other fields completed as you see fit). 

Get back in touch if you have any further questions!