How do I match employee receipts for reimbursements with payments and properly categorize them in quickbooks.

You should create a separate check in QuickBooks for reimbursements outside of their payroll.  That check should be coded directly to the respective expense account.  It's important to have this separation because employees should not be paying employee taxes on reimbursements.  To be clear, reimbursements should be paid completely outside of payroll.

This doesn't make sense as we don't write paper checks for employees and the only way we can reimburse an employee with quickbooks payroll is through the paycheck.  They do not pay tax on this amount, it is categorized as a reimbursement.  Quickbooks payroll is set up to to this (see https://quickbooks.intuit.com/learn-support/en-us/help-article/reimburse-expenses/reimburse-employee...). but there is not guidance on how to properly categorize the reimbursements in the P&L other than as reimbursements.