You can select multiple topics in the Topic List using normal
Windows techniques and then apply a tag.
The build will be whatever topics you don't exclude so with
three tags, you can exclude any one or two of them. You can exclude
all three if you want. :-)
Topics you never want to exclude, leave untagged.
Use multiple layouts to save keep changing the expression. So
if you are building webhelp, create copies of the current layout
and in the copies select the expression you want for that layout.
Use names that indicate the expression such as WebHelp A for the
help where the expression is Not A and Not B.
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