Ok, the quick and dirty answer is that in the Create New Volume command you reference the volume object itslef in the name (see screenshot attached). If the new volume object name is volume1, in the name field you can type "cifs_"+volume1.aggregate.name"+"_"...
The longer answer is that you would first need to use a finder to find the latest volume with that naming conention to figure out the number you need to use at the end of the new volume. Do you know how to do that or do you need help with that?