Transfer of heat from one side to the other

am trying to attach a pcb to a device that that is producing a decent amount of heat energy. The board will be on the top side whereas my heat sink is attached on the bottom side. Which is the best way that i should use to transfer the heat generated from the bottom to the to?

Google “via stitching for heat transfer”.

After googling via stitching for heat transfer as directed I came across this article on how to do the via stitching for heat transfer in Proteus EDA. I think it is very helpful because I was able to solve my issue. Check it here;

https://www.labcenter.com/blog/pcb-stit … shielding/