Pulldata from field in sub-group

Hi, I am using xlsform on Ona OKD and I linked my data to dynamic datasets to another form
I need to pull data from field which is in two groups like this:
group1 name: non_er
group2 name:vulnerability_check
field needed to pull: beneficiary_name
in csv file it apears like: non_er/vulnerability_check/beneficiary_name
how can I use that in pulldata function.