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You may have struggled to cut a pattern based form with a loaded void, where you have modelled extrusions  or other forms directly into the Pattern based family template.

If you actually replace your plain extrusion forms with a nested Adaptive Generic Model in the Pattern Based template, you will be able to cut it with a Loaded Component, such as my SuperVoid family.

From Philip Chan's blog:
The concept is simple, I make a Generic family (it can be any category actually) as a solid (in this case, just a simple extrusion), let the family intercept the curtain wall, then use "Cut Geometry" to cut out the curtain panel.

Once I made all the cut in the curtain wall, I have a yes/no parameter to control the visibility of the solid so that I can "turn off" the solid. As a result, it would appear that the curtain wall is cut out by a void. The good news is you can use the same family to make multiple cuts and it will work on the mullions as well.

Read more:
http://phil-osophyinbim.blogspot.co.uk/2013/08/curtain-wall-and-engraving.html

Ever wanted to "hide" a void, or stop it from cutting?  There are at least two ways:

1) parametrically moving the void outside of the solid form when you dont want it to cut (this is the "old way")

or this interesting solution via Twitter:
2)

@revitspace @the_reviteer @barleyboy voids in host based family duplicate nest one not cut geometry link family type to yes no done easy.145
— Johnny Furlong (@FurlongJonathan) March 22, 2013