I will tell you how to do what you want to do, then I will tell you how I recomend doing it. First of all, you could use "AMCOMBINE" to combine parts in a child sub-assembly but it will not work in a parent sub-assembly. By parent sub-assembly, I mean a sub-assembly can have...
I use the TI 83 Plus. I use it daily, and it's worth it's weight in gold. Texas Instruments has higher end models out there, but this has served me well. I draw complex sheetmetal parts and machines in Mechanical Desktop 6, and I rely on the TI for speed and reliability. It is very easy to...