使用不同的列强制data.frame，使用R中的另一个data.frame

I have two data frames with unequal column dimensions that I am trying to add together. I am open to other possible solutions, but ideally, I would like to coerce the data frame with a lesser amount of columns to be the same size as the other data frame and introduce NA's where the data is missing. Here's some code: I have two data frames with unequal column dime