Will it be possible to sort with more than 2 levels?
Is your question for sorting indented rows (hierarchy)? Could you please elaborate.
Following up on Santosh’s response, if you are sorting a hierarchy, each level is sorted independently and in the order of the defined sort conditions on the current View. Our help system article on Row Hierarchies may help in this case.
Otherwise, if you are sorting a non-hierarchical list, you can define any number of sort conditions. For example, here is a View with 3 sort conditions defined:
Spreadsheet.com will first sort the items by column A, then by column F, then by column E. You can re-order sorts to change the order of priority by dragging the drag handles on the left.
Our help system article on Sorting and Row Order may help.