I am not exactly sure what you intent yo do. I read you want the value of the name attribute of a selected Unit object to be copied to an attribute in Table1? My initial response would be: why would you want to do that? This is duplication of data in a normalized database, which is generally speaking, not good practice. Although there are exceptions to this rule of course.
Normal practice is that you make an association between Table1 and Unit, and use the value of the name attribute over association.
If you really want to duplicate data, you can do so by having the “save” button of the page call a microflow and do the copying there.