I need for Excel to sort by the numbering system 1.1, 1.2, 1.3, 1.4, 1.5,
1.6, 1.7, 1.8, 1.9, 1.10, 1.11 and so on. It does not seem to recognise this
numebring.

I have tried to creat it under the custom button but it still doens't work -
any ideas would be appreciated.