Adding an account itemizer in HMS These account itemizers are required: Tip Service Charge (Only the transaction code to add) Discount (Only the transaction code to add) HMS Account For tip, service charge, and discount, only the transaction code to add. Select Configuration > Groups > HMS Transaction Code Mapping. In the Account Itemizers section, click Add New Specify this information Transaction Code Specify the transaction code for the account. Accounts Assigned Select an account from the drop-down menu. Click Save Changes.