Parent/Child Full Unit PLC Symbols

I'm trying to create a symbol for a fairly complex servo drive that has i/o on it. I would like to make it a plcio symbol so that when I "ae edit" it the i/o descriptions are available. I need to split the symbol into two parts to fit on the drawing and would like it to behave like a parametric plc symbol that is broken into two parts (parent/child). I'm not understanding/seeing what would make the child plcio symbol a child. When I look at the blocks created by breaking a parametric symbol, they are named randomly. The only real link I can see is TAG attribute on parent and TAG_1 on child. I tried that convention on my full blocks and it doesn't seem to produce the desired result. Is there something else I need to do?

Two options:

1. Build the drive using the parametric method and mark your break points as needed. (Check the "Break After" check block.) You many need to create additional blocks. (As example a USB port.) Just pick one style for the blocks and use that one for building the drive.

2. Build the drive as one block then use "Spilt PLC Module" to break it into additional sections. You can use this more than once.

AutoCAD Electrical will automatically copy the tag name with both methods. You can use the "Split PLC Module" on the parametric block if need.