Many SSL certificate licences allow to install the same certificate on an unlimited number of server, so it's not necessary to buy a new certificate for each server.
So, check your certificate license.
If it's allowed the install on more than one server, there are two methods to do it:

The first method is to import the certificate, private key, and intermediate files on server #2, #3, etc.

The second one: create a new CSR and key file on server #2, #3, etc. and reissue the active certificate.

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