To do Alt + W S on Mac in Excel, download and install Accelerator Keys, then press Option, followed by W, S.
Command: Split
This is how to do Alt + W S on Mac in Excel with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with Excel.
Alt + W S split divides the worksheet into panes that scroll independently. This lets you view different parts of a large worksheet simultaneously.