Add Formula on an Output Doc

[pmiech]

I am creating a Parts Order/ Estimate Document.

I am having difficulty getting a column total on an output doc.  There are multiple lines with a total price calculation on each line.  Looking to have a grand total at the bottom of the column. There are values in the fields above it.

Here is what I have from the help docs but no total appears.. 

	{{$M.Parts_Order_Line__Parts_Order_.SVMXC__Total_Line_Price2__c.Label}}
Total	{{$F.add($D.Parts_Order_Line, 'Total_Line_price2__c')}}

Any help would be appreciated!