To add a Lump Sums Total, you have to double click on the Lump Sums Totals Header Cell, not the Cell in the Subcontractors column. Here you can Add, Edit and Delete Lump Sum information.
You can edit values for the Lump Sum Rate, Quantity & Total for each Lump Sum within the panel or the Single Subcontractor Lump Sum form, once one has been added.
