Sheet Names in NL(Sheet)

I have seen a few different problems with NL(Sheet) and a few different solutions for the problems. I feel like I have a unique problem and would really appreciate any help that I can get. 

I am trying to generate sheets based on 2 lookup() for account segment 1 and account segment 2 in Dynamics GP. I can generate sheets and the function works great except for the sheet names.

Right now I am using the following function

 but the sheet name is as follows 


How can I change this long name to probably "10-000" based on the two account segments or probably even like "10000". 


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