Hi tina2626.
If i understand you correctly, your tables should be designed so that the quantity of account numbers for a company grows vertically.
IE
CompanyName Count AccountNo
Microsoft............1.......123456
Microsoft............2.......456789
AppleInc.............1......345677
etc
it should increase like this
ie
CompanyName........AccountNo1......AccountNo2..... ..AccountNo3 goes onnnn
Microsoft...................123456............2324 2343..............354543534
Microsoft...................456789............3423 423..................23424234
but it shld increase at runtime.
no account number creation at the time of table creation.