CAD v CADo, page-80

Advice/Knowledge please. I have an order of CADO in at .001 and I have finally made it to Number 3 in the Market Position on CommSec HOWEVER my order expires tomorrow 27/4. IF I amend my order today and extend it for a further 30 days (if this is even possible to d0 via Manage Orders option on CommSec ) will I retain my current position at #3 or will I drop back down to the bottom of the buy queue? My worry is that if I fiddle with it today I will stuff it up when possibly my order might be filled by close of business today? BUT if I leave it as it currently is then my order expires tomorrow anyway therefore any new order I place I would obviously join the end of the queue again. Does anyone know please re amending/extending a current buy order via Commsec as to whether that would affect my current place in the queue? Many thanks.