Tracking reimbusements in Transactions

We recently started a business and bought furniture and inventory with our funds for a client, to be reimbursed later. How do we categorize those items when going through our transaction list in Quickbooks? Do we catagorize them as "Supplies" or can we create a new catagory? This will help with taxes and expenses since this wasnt a true expense that we incurred, rather just us buying items to be reimbursed later. Thank you.