An assembly can be attached before or after doing the takeoff.  Click on the three dots next to the takeoff name to get to the sub-menu, and then click "Edit"

At the bottom of the screen will be an Items and Assemblies section ( this is also viewable when creating a takeoff).  Click the green "+ Add items and assemblies" button

The folders contain the assemblies.  Click to expand the folder and sub-folders.  You can attach one assembly or multiple assemblies by clicking the green "+" to the right of the assembly. Then click the Add Assembly button, and answer the questions to yield the materials

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