Akai S6000 Operator's Manual page 146

EDIT PROGRAM
136
You can confirm this by pressing RENUMBER:
In either screen, you can convert such a setup simply by moving the
cursor to program sharing the same program number and pressing
CONVERT OLD MULTI. You will receive this prompt:
Press ADD TO CURRENT to add the selected program number to the
currently selected multi or press CREATE NEW to create a new multi to
add the program(s) to. If you create a new multi, its name will be that
shown in the prompt (i.e. S1-3K MULTI 1).
s5000 / s6000
Version 1.21