Add new evar to Analytics extension

Hello everyone,

I am trying to add a new evar to the Analytics Extension in the Global Variable but when I try to select it, I dont see it. Previously,I added new evar in the report suite. The new evar is only in dev report suite.

If I add the new evar to production Report Suite, I can see it in the extension mapping. My question is how can add the evar to only to Dev Report Suite and map it to the analytics extension?

Any suggestion? 

Thanks