AutoCAD Inventor :: Getting User Selection Within Part Edit Mode In Assembly File

I'm working on Autodesk VBA, and I'm trying to get user input on which vertex to use for a constrain. I want to make a macro that can go into part edit, allow user to select a vertex, and then automatically set up the constraint. Initially I wanted to do this in a single macro, using this short piece of code

while oSelectSet.Count <>1
DoEvents
Wend

While this worked when run directly from VBA, if I call it as a macro in Autodesk itself, the DoEvents doesn't seem o work because I wasn't able to make any selection at all. I googled and it seems like this is just how macros are.

So I split the code into a 2 subs and a function (as attached), and put them into separates rules that I call using a form in Autodesk. The first sub "Meta1Pin1_1" works, then I would select a vertex in edit mode. But when I go ahead and call the second sub "Meta1Pin1_2", I get the error message that I created which says no vertex is selected. But if I select a vertex and call the second sub again, it will work.

So I've been trying different things and I realize that every time when I first call the second sub, my selection is erased teh moment it goes into the sub. But, for some unknown reason, the selection will remain when I call it the second time. I can't figure out what exactly happened between the first and second call of the same sub, that allowed the selection to remain.  

' prepares assembly for user input by grounding bones and going into part edit
Public Sub Meta1Pin1_1()
Dim oDoc As AssemblyDocument

[Code]....