It will be possible when using Code-First:
https://entityframework.codeplex.com/wikipage?title=Code%20First%20Insert%2fUpdate%2fDelete%20Stored%20Procedure%20Mapping
regards
CFI
https://entityframework.codeplex.com/wikipage?title=Code%20First%20Insert%2fUpdate%2fDelete%20Stored%20Procedure%20Mapping
regards
CFI