I don't like McCormick, but it is the #1 selling estimating program. I think it is because it is economical and they have capable salesmen. That said, if you are stuck with it, as someone else suggested, do some on line tutorials, or call their tech support. As far as what to put in an assembly, that is personal. I agree with brantmacga. A lot has to do with making sure the assembly as a whole reflects an accurate # of hours. Does it really take3- 4 hours to run 100 feet of 1/2" EMT? No, the actual putting it in the air takes very little time, but you have to order it, unload and store it. Move it to the work area, move it to the work location, plan the run, climb the ladder to install it, etc. You could put time in for each step or you can figure the 3 hours is average and then add when the conduit is over 10 feet in the air or up three stories or more in a building.