Description

 create_pblock test
 add_cells_to_pblock [get_pblocks test] [get_cells [list sb]]
 resize_pblock [get_pblocks test] -add {SLICE_X20Y50:SLICE_X30Y60}
 set_property GROUP {CLOSED} [get_pblocks test]
 set_property PLACE {CLOSED} [get_pblocks test]

CRITICAL WARNING: [Constraints 18-76] The AREA GROUP attribute 'GROUP' is not supported in this version of software. There does not exist an XDC equivalent. It will not be converted.

Solution

Note that this only closes the pblock's sites.  Outside logic can still use routing resources.  We do not yet have EXCLUDE_ROUTING.  We do have CONTAIN_ROUTING to keep the routing of the Pblock within its sites.