You can use the SAS Add-In for Microsoft Office to use Excel as an interface:
http://support.sas.com/documentation/onlinedoc/addin/
There is also a SAS Support Community:
https://communities.sas.com/t5/Integration-with-Microsoft/bd-p/office_analytics
And a YouTube video:
https://www.youtube.com/watch?v=UvW3YB3sYOc
If you use SAS/OR, the constraints enforce the restrictions directly, without the need for an IF statement.
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