Click anywhere in the rows highlighted then drag down the cursor. Click anywhere in the highlighted rows, then drag your mouse or cursor down to see the section of the table split from the original one.
Yes. A burner phone number can be traced. All mobile phones (including prepaid ones) and burner apps go through a cellular carrier or virtual number operator. Your identity can be tracked through call logs, data usage, approximate location, and text messages.
You can do this by going to the Formulas tab, then clicking on the cell you want to trace and then clicking on the Trace Dependents button. As you can see, there is a dotted black line that points to what looks like an icon for a sheet. This means that there is a dependent cell on another sheet.