Question! please answer...

I have upgraded my roster with the Knicks-GS and Knicks-Clippers trade. I saved it. If i copy the players.dbf of my roster and paste it in my dynasty. Will it make my dynasty crash?

Don't do it. You will lose all your season data and probably many other problems. It's not worth.

You can make these trades in dynasty though with dbf editing. Here is how to do it.

Definitely make a backup first though, in case anything goes wrong.