On the wholesale menu day page click Clone. In the Clone this menu window set the Start date and End date, choose one or more kitchens under Filter kitchen location, then pick the target menus under Select wholesale menus (the list loads the wholesale menus of the selected kitchens). Click Clone menu.

For every retail/wholesale fulfilment day in the range, on each target menu, Sprwt adds every active meal from the source day that is not already there, and removes meals that are on the target day but not on the source day - except meals that already have orders, which are always kept. Inactive meals are skipped. You must select at least one target menu, otherwise nothing happens. Note that the modal's own subtitle text ("Any day in that range that already has a menu is left untouched") doesn't match this behaviour - existing target days ARE modified as described above, not skipped.