just added a couple of points and realized i needed to insert them at a different point in history first. deleted them from pattern piece but still unable to delete them.
To delete the lines that you created in the wrong place, you also need to delete any lines connecting 2 points and any other objects created that connect to the line that you wish to delete that were created afterwards.
In your case, A159_a44 will need to be deleted 1st, since it’s a mirror of A159.
If you used the point in a pattern piece, then you must 1st delete the pattern piece, or the reference to that point in the pattern piece, before the Delete will become available.
When using the History, remember that if you create an object at some previous place, you need to select that line in the History before creating the next object that will reference the object just made, otherwise you’ll be trying to create something before the reference object has been made.
The History doesn’t move down onto the object just created.