Concatenate OR Join Columns values

Hi community!

Could you please help? 

I am trying to add a custom column called [IndexKey] in Power Query to deliver the same outcome I have in a normal Excel table. 

In a normal excel I have the following columns and values:

[PO number] (type as general) = 123456

[BillingDate] (type as short date) = 01/01/16

[CampaignName] (type as general) = Emirates is the best

When I use EXCEL CONCATENATE function I got "12345642370Emirates is the best" (this is exactly what I need as a kind of an index key)

Now jumping into Power Query, when I try this: [PO number] & [BillingDate] & [CampaignName] I got: "12345601/01/16Emirates is the best" (this is what I do NOT want).

I can imagine why this is happening (I think because of the special character &), but I want discover a way in which I could get the same outcome as Excel tables, but adding a custom column through user interface in Power Query.

Thanks again for your support.