Cube Actions Questions

Hi I have couple of questions when i tried to implement actions on my cube:

1. I have a action on [Product].[Product ID] based on ID ( [Product].[Product ID].CURRENTMEMBER.NAME )

Now i want to have the same drill down on [Product].[Product Name] when users drilldown he needs to use ID and drilldown to another appliactions 

Expression i used is listed below it works on [Product ID] when i use expression for Productname it always goes to All member, is there any way i can get corresponding ProductID and drill out?

"http://Test.com/iew/" + [Product].[Product ID].CURRENTMEMBER.NAME +"/"

2. How to implement substring in expression some of the product ID's are listed as 

1232,1123

123,456

I need to get just 1232 or 123 and then drilld down. 

Any help much appreciated

Thanks