Currently I can only find copying current object’s property value to associated objects’ property, but it is impossible to do the other way around.
Simple example: a Deal and its Associated company. We can copy a value from Deal to the Assciauted company (what for?), but we cannot copy a value from Associated Company to the Deal. However, the often case is, when a new Deal is created, we want to copy something from the Associated company to the Deal (eg, company name).
This limitation hand-ties greatly what we want to do with the workflow. The Association is a very good concept from HubSpot, but this value access limitation is a bit surprising.