Import users to openfire

my question is if I can create a list of users in openfire, users can import a list such as Excel, is that I have a list of all employees of the company and create one to one I spend much time, as I can make a more efficient

You can create a group in Openfire and the go to that group settings and enable Contact list group sharing. There you can share a group of users with another group or a number of groups or just with everyone.