It has been asked here a time or two recently what methods can be utilized to generate custom TLE sets. Some focused on how to manipulate files while I offer a suggestion for downloading a custom set tailored to the satellites you seek to observe.
The method I utilize is via the website Space-Track.org. There you can define favorites lists containing the satellites you desire to track. From the Favorites list you can then retrieve a custom set of TLE based on the list you create.
You can create multiple Favorites lists containing satellites that suit your fancy. I have two lists created; one for inactive satellites I occasionally monitor and one for active transponder satellites.
Visit https://www.space-track.org and follow directions. The site is fairly straightforward to utilize and works fine in Internet Explorer, Chrome, and Firefox..
73 Clayton W5PFG