Here's a sample, using the following 3 tables:
ChangeRequests
Titles
MagGroups
SELECT cr.bill_to, cr.title_id, tt.title, tt.mag_group, mg.mag_group_id
FROM
(dbo.ChangeRequests AS cr
LEFT JOIN dbo.Titles AS tt
ON cr.title_id = tt.title_id)
LEFT JOIN dbo.MagGroups AS mg
ON tt.mag_group = mg.mag_group;