Hi
You can add a part called “Labor” and add it to the various assemblies under the Quantity tab.
I have seen some people have different types of labor parts. “Masonry Labor”, “Framing Labor”, etc. These parts are added to the assembly and the relevant formula given so the right amount of labor is calculated for the type of labor.
See the following documents for help:
https://www.cadsoft.com/formulas/
https://www.cadsoft.com/estimating-assemblies/