How to join Videos Ffmpeg?

Hi VideoHelp community,

Here is my problem and hope someone help me to solve this.

So i have some files like video1.mp4 video1.ass video2.mp4 video2.ass ... , i need to hardsub video1.ass in video1.mp4 and cut video1.mp4 with a start and end time,
and i need to do this for every video and sub, and finally join the created files.
Can i do this with one command in ffmpeg? If not, how to save all created files with same parameters then to use the ffmpeg concat withour reencoding, or how to
merge video files with different video parameters. Thanks anyway.