I would like to take the family on vacation from SEA to SAN and use my free companion cert for Mrs DHB and use miles to pay for Jr DHB1 and Jr DHB2. I would like to pay for my own ticket (well, have the office pay for my ticket since HQ is in SAN). Is there a way to do this on-line all in one package or do I need to call in and do this? Or am I stuck doing this in two online transactions?

I have not redeemed any miles before with Delta so I am new to this side of the equation.

Thanks in advance for your helpful replies.