Hello Shrinivas ,
It seems to me that there is no way to import from Export Package by Line Number.
However, you could import all the drawings to a new project and then using PXF Export to export whole line using Project Tab in AutoPlant selection. This will create pxf export files for selected LIneNumber. Now you can Import pxf files to required project.
I hope this will help.
Regards,
Artiom
