Change the time signature in a beat sample

[Leier10]

Hello and sorry for any mistakes or repeated question, first post here. I would like to know if there is a way to change the time signature in one beat sample from 4/4 to 3/4.
For example, the whole song is 4/4, but in the chorus, after three 4/4 there is a 3/4.
I don't know how well I can phrase that question, I didn't study much music theory so forgive me once again.

[musikbear]

Hello

Hi, Welcome to the Forum Leier10 !
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and sorry for any mistakes or repeated question, first post here.

Np :)

a way to change the time signature in one beat sample from 4/4 to 3/4.

Well time signature changes does really not change anything, except the 'fit' in the beat-grid
You can see that i this video:
https://youtu.be/24iarkQyQ_8
I suspect that what you really are looking for to be able to do, is the make and actual stretch of the sample, so that the down-beat in real-time occur at a different time.
We cant do that in LMMS, but you can in Audacity
It is free, solid and well maintained
We dont hesitate to recommend it :
http://www.audacityteam.org/download/
'FAQ:
Here is a link to their wiki
Speed: http://manual.audacityteam.org/man/change_speed.html
Tempo: http://manual.audacityteam.org/man/change_tempo.html