Problem

Where is the tool "Loft Rectangle to Circle" in CONNECT?  

Solution

The tool "Loft Rectangle to Circle" can be found under Workflow Modeling > Surfaces > Create Surfaces > Loft > Loft Transition

Other option how to find this tool is to use following key-in: loft blocktocircle

See Also

https://docs.bentley.com/LiveContent/web/MicroStation%20Help-v15/en/LoftBlockToCircle.html