Hadd and ignore a tree

Dear experts,
I want to hadd 2 root files in which I have 2 trees (t1 and t2), but I want to add only t1, is this possible? Indeed I saw a "-T"option but I understood that it will ignore all trees, if I’m right, is there a way to do that?

You could try to “extract” your tree from one file using “rootcp” (i.e. save it to another file and then use “hadd” to add your other file).
Or you could make a copy of one of your files and “remove” the unwanted tree from it using “rootrm” (and then use “hadd” to add your other file).

Dear Pepe,
ok, thank you for your answer.