[API] How to update a pick list UDF field through the API?

[API] How to update a pick list UDF field through the API?

We currently have several custom UDF pick lists in our instance, and one of them is something we'd like to automatically sync from another source. I'm looking at creating a script to automate this for us so we can be sure the SD Plus UDF pick list stays properly in sync. Doing this manually through the front end introduces a delay in the syncing, and is often a source for people making mistakes when manually entering the data.

Is there any API's available for inserting/updating values in a pick list?
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