How to create a MDS entity via Excel add-in?
In this Post, we’ll see how I (as an Administrator) created a Master Data Services Entity via MDS add-in for Excel:
1. Created a Model via MDS Web Application. I named it “customer Information”

2. Switch to Excel
3. Open the File that has the Data that you want to load to MDS
4. Switch to Master Data tab in Excel
[Resource: Steps I followed to Install SQL Server 2012 Master Data Services (MDS) on my Demo Machine: And then Installed the Excel Add-in]
5. Connect to MDS server (via Excel add-in)
6. Select Model as CustomerInformation
7. Under Build Model, select Create Entity

8. Configure the values in the “Create Entity” > click OK

9. Switch to MDS web application to see the new entity:

I hope this helps! Your comments are very welcome!
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Official Resource: http://msdn.microsoft.com/en-us/library/hh479642.aspx (MSDN)
