How to mount database copy without specific datafiles

Hello all,
I need to make a database copy without specific datafiles. This is due to, in the copy, I just need some, not all, datafiles.
I tried the following command:
startup mount
alter tablespace mydata offlineBut it appears that the database must be open.
Anybody have performed some similar?
There is a document where I can read about it?
What else I need to know in order to start up this, reduced database copy?
Thank you in advance.

Hello All,
Thanks for your answers.
Yes I have already copied some filesystems to another server. All the data I need are on that filesystems. I haven´t tried to open the database. So, in order to put it online, and taking in consideration all your suggestions I will perform on this sequence:
startup mount
alter database datafile mydatafile1 offline
alter database datafile mydatafile2 offline
alter database datafile myindexdatafile1 offline
alter database datafile myindexdatafile2 offline
alter database openWith this steps, the database should bring online. Correct?
There is another step, that Im missing?
What about the listener?
Will be enough to change the port and server name?
Thanks again.

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