Carriage Charges

[designercolours]

I would like to set up a carriage charge value for each invoice, on the basis of anything under £250, will be charged at £8.00. Anything above £250, will be carriage free. If possible, I would like this to automatically appear...However, this is required to be set to a specific department.

I am running Sage Line 50 Version 13 on Windows XP.

Any ideas on how to set this up?

Thanks in advance