On the forwarder you want to set up an input for every occurrence.
Then, you would specify the sourcetype on the input.
(DHCP, windows update, wmi, etc)
If you are using a light/universal forwarder, you build filters based on the sourcetype on the indexer.
If you're using a heavy forwarder, then you do the same thing. Specify the input, and sourcetype. Build a props entry based on the source type, and build a transforms entry based on the TRANSFORMS field.
On the indexer, the props/transforms are in etc\system\local
You do need to add an entry for every unique sourcetype.
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