for now i don't have yet print screen step by step for GSM 3900 for BSC6900, but it still common for BSC6000 series, the same procedure and environment.
Please see attached "Common BSC6900 GSM Configuration Usage Guides" you can see slide for 3900 Configurations HW and Cell.
I will try to make print screen also step by step for your request, for now check my post
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