You can map custom shipping methods from your channels, which can be useful if your shipping methods do not show up for some reason. This is especially useful for Magento users using extension such as Matrixrates.
At the map shipping methods box on the add/edit shipping rules page:
Select 'custom' from the drop down, which will take allow you to type a shipping method name you have on your channel. This should be EXACTLY as it is in your channel. ie. Case sensitive with no extra or missed spaces.
You can then carry on with the rule as normal, ie specify any other constraints you need to and finally hitting save at the bottom of the page when you're complete.
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