How to reference main report field in subreport calculation

[rickr]

My main report will populate a field X, but int he sub report, I need to
reference that X value in order to do a calculation. How do I do this and
where?

 

[Marshall Barton]

My main report will populate a field X, but int he sub report, I need to
reference that X value in order to do a calculation. How do I do this and
where?

Try using Parent.[field x] in VBA code or in a text box
expression.