To refresh the intellisense after adding a new table or columns, is actually pretty easy. I used to end up restarting SSMS, but no more!
There are two ways to refresh the cache:
1) Go to Edit -> IntelliSense -> Refresh Local Cache
2) Hit Ctrl+Shift+R
https://blogs.msdn.microsoft.com/dtjones/2008/09/11/refreshing-the-intellisense-cache/
