Hello,
It depends on Your definition of "multiple".
Generally speaking, 2...10...15 commands are fine to copy-paste in CLI.
Anything above that - You could run into CLI buffer overflow, lost chars and mangled CLI input as a result.
I would suggest to write all Your "delete" commands into a text file, upload it to the router, and from there, run:
edit
load set <pathname/filename>
commit
HTH
Thanks
Alex