Are you using the right click menu? I used to use that for paste to original coordinates but sometimes it was greyed out even though pressing ctrl+v would bring the copied information in. If that is it try using the drop down edit menu to paste to original, as that seemed to work for me.
You could also try using ctrl+shift+C to copy with a base point pick a suitable base point then ctrl+v to paste it into the drawing.
Long winded workaround create a block of the info you want to copy and bring it into the new drawing with design centre.
To trim/extent lines that aren't touching but will intersect try Fillet radius 0,0. I have it set as a macro to always default to a 0 radius