It is helpful to use the Audio Edit Window, which you can expand to allow you very precise selection at the maximum resolution. Use the "Select Whole" Button to highlight complete track then use the cursor to select the start of your selection and select F7 to confirm the start point.

Now find the end of your selection and select F8 to confirm it. You can refine your selection at either end by clicking a new postion with the mouse while depressing the Shift Key.

You can now use a number of ways to move/copy/delete your selection. For Example: if you use Cut and Paste, then the selection can be pasted exactly to a Bar, note, Ticks position. Drag and Drop has a panel which can also provide with pecise information.