You mean save the slices settings?
Audio Editor > FILE > SAVE SAMPLE SETTINGS
This creates or updates a file associated with the sample. This settings are automatically loaded with the sample, if it is in the same folder, so move it too if you move the sample. Ex :
In a new project, default track samples are slots 1-8 (static of flex) for tracks 1-8. This settings are stored in Parts.
If you want to assign a different slot to a track in a different pattern, you have to change Part*, otherwise it will mess up your previous pattern(s).
There are 4 parts per bank (16x4), each bank being independent. New bank means new parts.
*Another way I prefer in a song is to use Sample Locks (hold a trig and choose sample with LEVEL). Otherwise you have to copy/paste parts oftenly when you make changes in a part (machines, fx, etc).
Beware, if you change a sample in a slot, it changes it for the whole project.