Sounds like you are using a custom quilt layout? In EQ6, you can select, copy and paste a block you've already put into the custom quilt. Select it with the arrow pointing at a dotted outline, not the basic arrow (It's the second option in my drawing toolbar). You can also resize blocks with this. Under "View", I have "Quilt rulers". That will help with sizing. Apparently EQ7 lets you set a specific size and drag/drop the block (I got a PM from dunster with this info), so that is a definite improvement.
Here's a quick look at my EQ6 screen. I have the "selection" option picked (on the right), and did a copy/paste (ctrl-c; ctrl-v) of the block.
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