InfoPath Dev

I know how to enter formulas in the properties area of a cell in InfoPath.  However, we have some old forms that we use regularly that are in Excel that we would like to convert into InfoPath.  As you know you can add multiple things (in our case receipts from travel) in one cell.  Is there a way to somehow import an excel ...

THank you for your help.  One of our programmers here did help me figure it out.  But please do send me the information on Infopath Training.  Thanks!!!

Patrick, I am sorry, but I am not understanding.  I have added a rule that states that Field 14 (which is the field with the calcualtion) is equal to Field79 (the option box)? 

I am creating a form that calculates the travel advance amount based on the data entered into other fields.  I go the calculation working (and rounding up thanks to you guys) but now I was wondering if there was a way for that particular field to only populate the calculation total if a "yes, I need a travel advance" check box is ...

Awesome, it works!!!

I get this error:  The expression is not a node-set. ceiling(-->(((field16*1.15)+field20)*field25)<--/5)*5

like this?  ceil((field16  * 1.15) +field20 ) *field25div 5) * 5 I get an error like this.

Do I put this before or after the the fist equation?  Sorry, VERY new to infopath!

I am creating a form and in one field I already have a function/calcualtion that includes other fields  ((field16 * 1.15) + field20) * field25 I need this calculation to round up to the nearest $5.  How do I need to write this formula to get that result??