we are migrating from M3 to M6.Is there any documents for new features in M6?
You might also find these resources helpful:
What's New in SAS Guide to Software Updates
What's New in SAS 9.4: November 2018
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Sorry, your question is a little vague can you be more precise about your situation. Next time please indicate more background like if you are a business user, administrator or sas installer?
If you are an administrator
Go through this link below and there are lots of directions on what you should do.
SAS Help Center: What's New in Migration for the SAS 9.4 Intelligence Platform
If you are a user - Whats new in SAS 9.4 M6
If you are an installer -
Install Center | SAS Support
The SAS Users Group for Administrators (SUGA) is open to all SAS administrators and architects who install, update, manage or maintain a SAS deployment.