Need Guidance : Need to add "Preferred Line" to a group.

[ParagJain]

I have created groups in my contact library and have grouped the contacts accordingly.

example :

family group is filled up with family members
Office : Office group is filled with work buddies.

Now, I recently added 2nd line to my iphone 12 for office work. I just can't seem to find a way to assign "Preferred Line" to entire group. I need to edit each contact and then update the preferred line option.

Is there a way to assign this preferred line option to entire group
If not, is there a shortcut anyone knows that can help me to do it.

thanks,