In VS > Solution Explorer > Project Node > Properties > SQL Settings
Select the Build (Debug, Release, etc.)
Easiest way to fill grid is use Import from Web Config
IMPORTANT: For redeployment scenarios uncheck the Deploy checkbox to not resend anything you don't want
Select a Row/Db
Enter the ConnectionString to use during deployment
This may be different than runtime connection string (imported from web.config) due to needing different admin UserName/Pwd…
TODO: Eg. Current deployer's account? But isn't that already being passed through?
IMPORTANT: By default imported connection strings are also set to automatically generate a script to create Structure of remote db based on connection string found in local dev connection string.