If you want proper 2D elevation views, dimensions, glazing areas, etc in your schedule, there is no way to schedule ganged windows as a single unit. You need to use a single library part that mulls the windows together in that case. There are a few standard MU (multiunit) library parts that give you some configuration options - but not with all operation types/configurations.
When I needed to assemble a complex mulled window that would be built in the factory as laid out - I had to buy Cadimage Door/Window Builder, as nothing in the standard library allowed for the complexity that I needed. My schedule elevations matched the factory configuration listing.
If your ganged windows are actually individual windows that are ganged on site, then they should be scheduled as individual windows of course.
Can you post an image of what your ganged windows should look like, and then perhaps someone here can point you to a standard library part that can be configured to be close to what you're looking for?
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