Sorry for taking so long to reply - I had to fly 1,300 miles to get back to my home computer.
One reason you couldn't look up blend is that it's not a Gmax modifier. My mistake.
You need to create a "Connect"
Prepare the two objects to be connected by creating an opening in each object. Do this by deleting faces. Line up the two objects in their proper positions to each other.

Select one of the objects you want to connect. Now go to the create tools and click on compound objects. Click on "Connect"
Click on "Pick Operand" - Then click on the object you want to be connected to. A connection is created.

By adjusting the parameters you can determine how rough or smooth you want the connection to be.

Hope this helps. Sorry about the mix-up in the terms. I was operating purely from memory, which is why pilots are taught to use check lists.