Using Current Context to populate a field

SOLVED

Hi All,

I wonder if it is possible to 'hold on to' information from the current record as you create a different record. 

For Example I create a Adv. Search Select field on Orders linking to Cases (e.g. orde_caseid).

Now if I'm looking at a Case and I do New -> New Order, the new order screen opens up but I would like it to also auto populate the Adv. Search Select 'Case' (orde_caseid) with the Case I was just looking at.