Get measure(mininum distance) with splines in group.

Hellow, I'm beginer and studying NXopen VB now.
I'm looking for the method to meausre between plane and curves in group(ex spline x66) which were made by dynamic section. and find out the minimum distance with curve.
- Group "Dynamic section"
-Group "Mysection"
-Group "Body 1"
- Spline x 66
-Group "Body 2"
- Spline x 23

How can I get the Journalidentifier for each spline in group?
- splines are non associate line

Your prompt reply will be appreciated.

Thanks.