Since LKAD is not telling you "served by..." these licenses are in the local license files. On Windows, those files are:
C:\Program Files (x86)\IBM\RationalRLKS\common\rational_server_perm.dat
C:\Program Files (x86)\IBM\RationalRLKS\common\rational_server_temp.dat
The licenses you import will overwrite ONE of those files depending on the type of licenses you import.
The simplest thing to do is to go into the files in question and delete the INCREMENT blocks you want to get rid of. They're just text files.
An increment block looks like this.
INCREMENT ClearCase rational 1.00000 15-jan-2015 10 {redacted} \
VENDOR_STRING="0|Floating|0| ClearCase:1.0" DUP_GROUP=U \
vendor_info="0|IBM Rational ClearCase Floating License Key \
(FLEXlm license manager)|0" ISSUED=02-jun-2014 NOTICE="Sales \
Order Number: {redacted}" ck={redacted} SN={redacted}
You need to get rid of the whole block, and not just the INCREMENT line.