prefix the job(s) you want to delete with xxx (i.e., xxxFullDatabaseBackups)

--NOTE: uncomment the delete part and comment out the select after you make sure the select --statement returns the correct records you want to delete.

--*SCRIPT*--

--delete sysmaintplan_subplans

select *

FROM sysmaintplan_subplans AS subplans INNER JOIN

sysjobs_view AS syjobs ON subplans.job_id = syjobs.job_id

WHERE (syjobs.name like '%xxx%')

--GO INTO SQL AGENT AND RIGHT CLICK TO DELETE THOSE JOBS MANUALLY...