I don't think there is a way, but it's scriptable with blcli. You can list servers in group, you can import serves from file, you can retrieve server property values, and you can set them. matter of some loops and the right blcli commands. all necessary commands are released (I'm pretty sure) and can be found in BLCLI Help under Server name space.
Great thanks for the reply
You can try following BLCLI ->
SERVERGROUP_DBKEY=`blcli ServerGroup groupNameToDBKey $SERVERGROUP_SUB2
blcli ImportExport exportObject 5007 $SERVERGROUP_DBKEY /c/exportedObjects/groupExport
And for Import:
blcli ImportExport importObject /c/exportedObjects/source_dir /c/exportedObjects/groupExport.xml