To Subtract One or More Solids from Another Solid

Select the Difference Feature tool.
Set Keep Original to None.
Select the solid from which the other solid(s) will be subtracted.
Select the solid to subtract.
The second solid is subtracted from the first.
Do one of the following:

Accept to complete the subtraction.

or
Select further solids to subtract.
Accept to complete the subtraction.

Left: Select the solid from which the subtraction will be made (1). | Right: Select the solid to subtract.

Left: Select the remaining solids to subtract (3 to 6) and accept (7) to complete the subtraction. | Right: Rendered view of completed solid.