DP4 - 4 decimal places
GRP GAT - Group Totals. Displays the same items as a totalsum for each column
GRP - Group Totals. Displays the same items as a total GRT - Grand Total
INV - invoicee, add the invoicee number at the end. Example: INV20 to show invoicee number 20, INV0 will show items not assigned to an invoicee, INV-1 will show all items from the booking regardless of invoicee. You can combine INV[BOOKINGINVOICEEID]] to add the invoicee from the booking