Change the name of the agreement (accord) without changing the key if song

[fletch]

Hi, I'm new one

Thanks for this site, it is very practice !

I'm looking for to change the name of the agreement (accord) without changing the key of song
For example: If I play a song with C as key, I will see a chord in C but I need to translate in the same time in D (I'm playing sax tenor (Bb)) and it's not very easy.

Is it possible to keep the tone of the song in C and having the chord displayed in D ? for my tenor sax?

I' tried to modify the name of chord but the song by itself change the tone..
I'tried to translate the song by "instrument à vent" in Bb but the result is the same...

Thanks for your help
f.