The standard grips this chord is usually shown with.
Bsus2sus4 is B, C#, E and F#, a suspended second and fourth. The shape this page opens on is written x22422, lowest string first.

Also written Bsus2/4 or B suspended 2nd and 4th. The same chord either way; which spelling you meet depends on who wrote the chart.
There are 4 common shapes for Bsus2sus4 on the guitar, and 23 derived voicings in 3 families.
In which keys. Every note of Bsus2sus4 belongs to C# minor (the ♭VII), D major (the vi), E major (the V), F# minor (the iv), Ab minor (the ♭III), A major (the ii), B major (the I) and B minor (the i).
The common shapes, written lowest string first: x22422, 7746xx, 779979, x-14-11-11-12-12.
Drop 2. A close-position chord with the second voice from the top lowered an octave. Sits on four adjacent strings. Bsus2sus4 has xx2422, 2424xx, x4445x, xx9979, 9999xx, x-x-11-11-12-12, xx4657, 7746xx.
Drop 3. The third voice from the top lowered an octave. The dropped voice becomes the bass, which is why a string is skipped. Bsus2sus4 has x4x452, 2x242x, 7x465x, x7x677, 9x997x, x-9-x-9-12-9, 12-x-11-11-12-x, x-14-x-11-14-12.
Open string. An open string left ringing against a fretted grip. Because it costs no finger, it sounds a note the closed shape has none left for -- a tension on top, or a pedal root underneath. Either a familiar grip with open strings added, or a shape so sparse the open strings carry the chord. These belong to their key rather than to a shape, so D, A, G and E have many and Eb a handful. Bsus2sus4 has xx4600, 0x460x, 0x4400.
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.