How do I incorporate CASE into this SELECT?

Here's a breakdown of what I need to do:

INSERT into tasks_master_tracker_idb (   
`DIRECTION`,   
`PROD_INBOUND_TRANSPORT_ADDR`, 
`PROD_OUTBOUND_TRANSPORT_ADDR`)
SELECT 
t.DIRECTION,
rt.TRANSPORT_4
FROM tasks t 
LEFT JOIN requirements_transport rt ON t.ID = rt.INTID__ and rt.ID = (select MAX(ID) from requirements_transport where INTID__ = t.ID)
WHERE  (t.INTID is not null and t.CUSTID is not null ) 
AND t.ID not in (select TASK_ID from tasks_master_tracker_idb)

If "t.DIRECTION" is "INBOUND" than I need to insert the "rt.TRANSPORT_4" value into, "PROD_INBOUND_TRANSPORT_ADDR." If "t.DIRECTION" is "OUTBOUND," than I need to insert the "rt.TRANSPORT_4" value into "PROD_OUTBOUND_TRANSPORT_ADDR."

And than if "t.DIRECTION" is "MULTIDIRECTIONAL," than I need to insert the "t.DIRECTION" value into both "PROD_INBOUND_TRANSPORT_ADDR" and "PROD_OUTBOUND_TRANSPORT_ADDR."

I'd like to think that there's a way I can deploy a series of CASES to get that done, but I'm not sure how to pull it off.

How can I do what needs to be done?

I'm running version 8.0.21 of MySQL