First of all, are you sure you mean MN and not WI??
If so, is it not:
Mindoro, La Crosse, Wisconsin, USA
If that is the correct name, why do you want to enter an alternative name for the spelling variation?
I can see entering two places if one name was for that place in 1700 and another name for that place in 1900; but I wouldn't usually enter different spellings in two different facts.
You can do what you want to by
1) One by one,or
2) copying and pasting the facts.
To copy and paste:
Make a fact (incl source citation) for a family member, then right-click copy and right-click paste. You can paste to parents, spouses, siblings and/or children of your selected person. You can move to another person and paste the copied fact (with source citation) to that person's parents, spouses, siblings, and/or children.
Does this answer your question?