Operands
You can drag and drop the required formula variable from the Formula
Variable dialog.
A simple operand is a single operand which is either numeric or a Formula Map variable, value label, value book, price book or user-defined cost.
A compound operand is a group of simple operands joined using the same operator. The equivalent of a bracketed sub-expression within a formula.
For compound variables, drop the formula variable on a simple operand to be included with it in a new compound operand.