Thanks everyone! Yes I have 2 PNRs, one with 3 people in first and 2nd with 2 people in econ. I just thought if I could have them both show up on the website without typing the the 2nd number every time, it would be easier to keep an eye on both. This is the first time I fly on Delta and just created the account this week.
I guess that's just not possible. Now I know.