On the timeline, select the desired clips. Press <ctrl-C> to copy them.
Click the + at the right of the Sequence 1 tab to create a new, blank sequence. 
In the timeline, right-click | PASTE (insert) to paste what you copied.
Return to Sequence 1 by clicking on its tab.
In the bin (top-left), click the Sequences tab. Drag Sequence 2 onto the timeline.
Or simply export Sequence 2 and insert the resulting clip into Sequence 1.