GST invoice Serial Number

Hello
One of our client is dealing in Electronics Goods he has following types of Receipt
1.B2B Bank Plus Cash
2.B2b Bank Only
3.B2b Cash/Bank + From Finance
4. B2C Cash Only
5.B2C Cash/ Bank + Finance
6. B2C Bank Only
So i want to know that in Gst it is allow to maintain different type of series of Invoices as per thier requirements as in My case above natures.In rule 46(b) it is only says about invoice numbers should be unique for each financial year and issued in a consecutive serial number.