Drag down over the lines you wan to edit to the timeline AND across the clip covering those lines.
Notice how the verticle line from the clip gets fatter as it is selected...or as you drag over it.
|Then hold down the Command + Alt/Option keys and hover over the top of the lines you selected where they intersect the clips coverage (represented by the verticle line) your mouse will turn into a splice icon. While holding down Command + Alt/Optionand double click to edit to your timeline.|
|The selected lines will be edited to your timeline (sequence)|
Do you need to know how to syncronize your script with Avid?
Here is the How to us ScriptSync