How to convert an instrument back and forth between single staff, grand staff and more?

How do I convert an instrument from a grand staff (like a piano) to a quadruple staff? And how would I revert it along a score?
For context, I am making a score reduction where a single grand staff for the string section is just not enough. I need the string reduction to have at least four staves. And in some sections, four is overkill - a single one is fine.

You could maybe create enough and then manually hide them when not required? You can auto-hide empty staves too if that suits.

Right click>Staff>Add staff above (or below)

To remove it Right-click>Staff>remove staff