Square to round transitions

I need to provide detail drawings for square to round transition. I have tried to use the command ProStructure Place Solid RectToCircle in Prosteel but nothing happens. I had to do this using the key in function because the command is not shown int the pick menu of PS Solids. Other commands from the PS Solids menu do work. Any suggestions? I also have an Aecosim licence. Which would be the best program to get the information from and how?

Brian