An assembly can be attached before or after doing the takeoff.  Click on 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 Add 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 + to the right of the assembly.

Then click the Add Assembly button, and answer the questions to yield the materials 

TIP:  The end of each assembly name shows the measurement type.  This measurement type must match the measurement type of the takeoff (chosen from the drop-down when creating the takeoff).

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