RCQ can drop a partition of a table space but RC/U does not will drop the partition.
Release : 20.0
Component : CA RC/Update for DB2 for z/OS
Select the TCP table for alter.
When in panel 'CA - Table Alter',
type LIMITS in the COMMAND line like (COMMAND ===> LIMITS) and hit ENTER.
This will enter panel 'Table Partitioning & Limit Key Values'.
In this panel is a line command under 'CMND'
type 'D' to delete the partition.