So to get back to original item (since my approach of sharing a subassembly wont work) 🙄
You need to define a enumeration. This is how we can create a way of choosing different insertion options, etc.

Then under that button we create a group and the different enumeration items. Add your new Enum Item (Flowline)

Each item needs to be unique.

After you have created your items, then you create a parameter and give it another unique name. In my case here I am using INSERT for my parameter name so that I can use this in the Switch workflow. You might already have this created per your original post, so go to your enumeration value and make sure it has that option as a drop down.
Then drag a Switch from the left hand side into your space (or if you already have the switch, go to the switch).


The switch expression is always "parametername".value. This more or less prompts the switch to follow the value selected in the drop down.
Next drag a connector from the switch to your next workflow (sequence, flowchart, etc.) But that connector wont know what it needs to follow until you left click on the connector (highlights yellow on screen).
When you click on it you will see:

Uncheck the isdefaultcase below and then

Where it says Case1, type in your Enum Value of choice. Make sure it matches the list above and you should now have the option to construct that switch's drop down.
Hope this helps and sorry again about the subassembly not working.