Hello Jose
In order to migrate the licenses from your existing RFS-7000 to the newly installed VX-9000 you should start by reaching out to your Extreme account team. The Extreme account team will work with you to complete a license migration form that they will submit to the Extreme GTAC. Once the licenses and Access Points have been migrated to the VX-9000, your account team will work with you to ensure that the licenses are decommissioned on the RFS-7000.
As far as the configuration goes, it kind of depends on how complex your current RFS-7000 deployment is. Typically, we would recommend you rebuild the config from scratch when moving from one platform to another, but technically you could use portions of the existing RFS-7000 configuration to piece together a new configuration for the VX-9000.