Delete values in a Combobox (Form Control)

[abduljaleel.mca]

Hi,

I have a button (Add a Project), a combo box will appear with types of project (like basic, global, analysis etc., ) in it once I clicked that button. There are around 10 project types in that combo box list. The combo box values are retrieve from another sheet (Sheet10, A1 to A10). I want to remove 3 project types from that list. If I directly delete from sheet10 (e.g. A8, A9, A10), these values are appearing as blank in combo box instead of showing only 7 project types.

Is there any way to delete these values without showing as blanks in combo box?

Couldn't do right click on the combo box to check with 'Format Control' as it appears if I click 'Add a project' button.

Please help...

Thanks
Abdul