Step 1 is to turn "on" make expenses billable from your company settings (gear icon) once you do so two extra columns should appear on invoices and checks.
Step 2 is to enter customer/job name in the line item of expense and then verify thatbix to bill ischecked.
Step 3 is to create an invoice or sales receipt for the customer and agree to add time/expenses.
At this point you can add a markup or not
If you cannot get past step 1 then step A will be to upgrade to Plus