Business & farm

When entering K-1 info a second time for same company because Part III has numbers in more than one box in boxes 1,2,3, I understand I only enter the dollar amount in the box I didn't enter in the first one. Please confirm. Also, On the first one ( i.e.  box1 & 3) do I only enter 1 box or do I enter both boxes so as to get the statement that I have to create more than one K-1 for one company? Also, on the second K-1, it is recommended that I only enter one of box 1,2, or 3, but not any more  boxes4-21. Do I also leave Part II blank in items J-N?