Sorry, but your question is not clear. Connect them to what exactly.
Are you possibly looking to add a connector pane so they can be used as subVI? In this case, simply right-click on the upper right icon, select "show connectors" and you'll see the connector pattern. Add/remove connectors as needed, then for each terminal, click on the connector followed by a click to the front panel object to be associated. (I also took the libery to add an error-out for symmetry).
Overall, I don't quite understand the logic of all this. Why do you need 8 different subVIs if they are all the same or very similar. Couldn't you re-use just one (possibly set to reentrant)? If they have very subtle differences, use an additional ring input where you select e.g. the
mode (1..8) when called. It seems to me you are overcomplicating things.