Calculating fields in LiveCycle from a form that I made in Adobe ProX

[horse_09]

I hope this makes sense b/c I am totally new to LiveCycle.  I made a form in Adobe ProX, but I don't like the calendar that I added.  I found LiveCycle on my computer and decided to "convert" the document.  Everything works on my fillable form, but I am clueless as to how I add fields. For example our techs work an 8 hour day, but 3 of them may work on the same job together, so I want that column to total.  I thought I did everything correctly, but obviously I don't know what I am doing.  Can anyone help me?