At this moment, the Scheduler (http://www.daypilot.org/scheduler.html) is only able to show two rows in the time header (X axis). The size of the cells in the first row can be set using CellGroupBy property (allowing Hour, Day, Week, Month, Year values). The size of the cells in the second row is determined by the CellDuration property - it always matches the cell duration.

You can customize the time header cells using BeforeTimeHeaderRender event handler. It allows you to set custom HTML (e.InnerHTML) and you might be able to use it to structure the cells further: display another table or set of <div> elements inside.

I'm not sure if that's what you need but you can add more columns to the resource headers (Y axis):

http://www.daypilot.org/scheduler-row-header-columns.html