Using 2007 on Vista

I've got some data I want to import from excel into my crm software
For type of business here in the UK we use 'SIC' codes
However, the data I have purchased has the SIC code followed by it's
description
I want to seperate the first 4 digits which is for the SIC code and
leave the description behind as per the following

data
3320: Manufacture Of Instruments & Appliances For Measuring, Checking,
Testing, Navigating & Other

Which I want to seperate into
SIC code 3320
SIC description Manufacture Of Instruments & Appliances For
Measuring, Checking, Testing, Navigating & Other

There's 1300 lines
How do I do this please?