When they say all portions must be transported together they mean in a vehicle. They know that you can't transport it all out on your back at one time.

You must leave the milk bladder on one portion of the meat if deboned, or quarter if you have access to horses, until the meat either reaches your house or the processor.

You can legally process it yourself in the field if you wish and once you start packaging it you need not worry about the sex of the animal. I believe ElkampMaster does this.

Basically if you are transporting it unprocessed it must have evidence of sex attached to one portion of the animal.