B.D. there are a number of ways to get back to the Bb. Since you didn't mention of you were coming from a B or a C# chord I'll take a stab at both , the dash mean to, i.e. B-Bb means a B chord to a Bb chord:

B - Bb
B - Eb7 - Bb
B - Ebm - Bb
B - C (EITHER MAJOR OR MINOR) - F7 - Bb

C# - ANY OF THE ABOVE CHORD PROGRESSIONS
C# - C - B - Bb
C# - F# - F7 - Bb

These were just of off the top of my head. As you can see there are a number of ways to modulate to another chord progression. What that transition is depends on what type of song you are writing and most importantly what sounds good to you.

I hope this helps.

Note that I purposely stayed away from jazz chords. I passed this on your chord progressions.

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