The standard grips this chord is usually shown with.
Bbsus2sus4 is Bb, C, Eb and F, a suspended second and fourth. The shape this page opens on is written x11311, lowest string first.

Also written Bbsus2/4 or Bb suspended 2nd and 4th. The same chord either way; which spelling you meet depends on who wrote the chart.
There are 5 common shapes for Bbsus2sus4 on the guitar, and 23 derived voicings in 2 families.
In which keys. Every note of Bbsus2sus4 belongs to C minor (the ♭VII), C# major (the vi), Eb major (the V), F minor (the iv), G minor (the ♭III), Ab major (the ii), Bb major (the I) and Bb minor (the i).
The common shapes, written lowest string first: x11311, 6635xx, 668868, x-13-10-10-11-11, x-13-13-15-13-13.
Drop 2. A close-position chord with the second voice from the top lowered an octave. Sits on four adjacent strings. Bbsus2sus4 has xx1311, 1313xx, x3334x, xx8868, 8888xx, x-x-10-10-11-11, x-x-13-15-13-13, 13-15-13-15-x-x.
Drop 3. The third voice from the top lowered an octave. The dropped voice becomes the bass, which is why a string is skipped. Bbsus2sus4 has x3x341, 1x131x, 6x354x, x6x566, 8x886x, x-8-x-8-11-8, 11-x-10-10-11-x, x-13-x-10-13-11.
The common shapes and the derived voicings come from different places, and both are explained in where the chords and the theory come from.
Shows each chord the way this style would voice it, and marks which of its alternatives belong to the idiom.