Watch the Dominant Soloing 2: 10 online guitar lesson by Brad Carlton from Bluesology 1

In this lesson we will explore further the idea of superimposing triads over a given root. Perhaps you have heard of slash chords: well, the chords in this segment are generally labeled as slash chords. For example: F/C, (read as F over C) G minor/C, A minor/C, B flat/C, etc.
Try playing a B flat arp over a C in the bass; you'll hear a great lick for a Csus7 chord.
The second part of this lesson will apply the same idea to 7th chords.