Some schedule patterns may not be selectable in All menus > Schedule management > [Schedule registration] .
This is probably because the target schedule pattern is restricted by the "employee type used".
Detail
Please check Settings > Schedule > Pattern Settings > [Edit] of the target pattern> [Details]> "Applied employee type" in the "Basic Info" category.
Schedule patterns in which only specific employee type are selected in the above items will not be displayed in the copy source schedule if the display condition is set to "All employee type" when registering the schedule .
The specifications are such that only patterns that can be used by all applicable employees under the display conditions can be selected.
Counter-measure
Please select and display the employee type when registering the schedule. You can select a schedule with restricted usage.