The apply % box in progress claims is used to claim a percentage of all visible lines in the claim - 

You can only apply a percentage higher than the current claimed percent

Example: if I have already claimed 10% of a line/s, the figure in the apply % field will need to be higher than 10 for any changes to be made.


As mentioned above it affects all visible lines (including multiple pages)

So you can use the select box at the top, if you only want to claim one trade, or only variations, provisional sums, etc.

For example if you select 001-Preliminaries, enter a figure and click apply % you will notice this will be applied to preliminaries only.