You can use the same sample in different slots with different Trim / Slices / Attributes settings.
These settings can be saved with the sample. It creates an .ot file on the CF card, associated with the sample :
When you load that sample, settings are recalled. If you change the settings, they are stored with the slot.
You can’t slice an empty sample slot. You can use a silent sample and slice it, save its settings, load it in any recording slot, and record over it, but it needs to be the same length / tempo to work properly.
You can use start points instead of slices, and plock them previously, without length / tempo problems. Same behaviour, except length / loop behavior. In slice mode, the length / loop is the slice, in normal mode it’s the whole sample.
Edit : loop points are also different in slice mode (per slice).