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.  The list of items or assemblies will only show ones that are compatible with the measurement type of the takeoff. 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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