Control NX attributes write to different worksheet in an existing excelfile

I have an existing VB that enable extract data from NX attributes to a new excelfile which is working perfectly. Now, I have a new requirement to extract data to different worksheet said "Worksheet-A" and "Worksheet-B" in the same existing excel. Anyone can help on the VB programs that can write data to different worksheet determine by the number of rows from NX attributes to different worksheet? Example like Attribute data 1 to 30 -write to worksheet-A and 31 to 60 write to worksheet-B? Thanks in advanced.