Simply structure of "BLOCK"

I would like to create BDD and IBD (SysML)

I added all blocks in a BDD and defined hierarchial relationship with "Composition" in order to structural view of overall systems and generate IBD of blocks to define releationship of the same level blocks.

Since hierarchial relationship were defined at the BDD, I drag blokcs from model eleprorer and drop them on the IBD expecting it would refer to the existing block but the automatically generated Parts

In the meantime, When i created parts under the blocks and tried to drag&drop them on the BDD i could see stop sign on the mouse

but the Tool created parts under the block. In that circumstance, the structure of model is too messy and it will be hard to identify unique element in the model exeplorer.

is it be possible for the model to refer to the existing "Blocks" without creating "Parts" in IBD?