how to change warfile name after the build process ignoring SPEC file warfile name?

I was looking for an answer whether we can change the warfile name to a desired name before RPM installation ( After the build process has been done and RPMs have been created )? For example; I have a spec file which has 'warfile name" defined as "Internal-custom.war" ( This will come from a source URL ). After the build completes. I have a RPM with a NVR " custom_project_internal_custom_********" . Then I install this RPM to my system and when I check it gets installed as "Internal-custom.war" . However, I want this to be installed as just "custom.war" instead of "Internal-custom.war" . I know I can only change this on spec file but I want to keep warfile name on SPEC file as "Internal-custom.war" but install as just "custom.war". This is due to a requirement on my system that it has to appear as "custom.war" .Is this possible?