First of all, if you used a Pro/e start part (default template), the parameter DESCRIPTION is created automatically, along with default datums, layers and views. This is what Intralink is probably picking up.
: I created a parameter in the part called "DESCRIPTION" : and I set it as designate
Before you go creating any new parameters, check 'Tools>Parameters' to see that this is not *already* a designated parameter. On my system, it is (exists and is designated) by default. Don't know what will happen if you try to 'create' an already existing parameter. : : It will not read this parameter in Intralink.
Try a parameter named differently than DESCRIPTION. Pro/e may have reserved this spellling for itself.
David Janes