Hi Bengt,
Just following up on some old threads to close them (Make sure they were answered).
Did this follow through for you eventually?
The way to use "Remove volume" is to find the volume and pass this volume as parameter.
If you'd like to squeeze in row parameters, you can do a define node for "array" using the array IP and then at the volume definition
just plug the array reference and the name.
Every define node in WFA requires the natural key of that object (What uniquely identifies it). For a volume it means the minimal attributes would be
the volume name and array IP/name (Volume name is unique in a storage array).
Hope that helps,
Yaron