Tomcat Wildcard certificate

Dear all,
I have a new server, the IT department already has a wilcard certificate they have been using on other servers.
they have sent me the .crt files that i should use on my Tomcat.
can some one help me with a step by step as the tutorials am getting seem to be pointing only if I have a CRS

my appologies as this might be off the core ODK

thanks
Ayoub