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can you transfer your tradepower in a node to another state?
any good guides on becoming rev france?

You can transfer a portion of all of your trade power to another nation although if I recall correctly they have to request it (or force it in a peace deal).

If you are asking about having your own trade power affect a different node than the node it's located in that is done automatically (more or less) when applicable (as follows).

In any node where you have no merchant present the following happens to your trade power:

home node: all power is used to collect
node that is immediately downstream from a node you collect in: a percentage (30% iirc) of your trade power in the node is applied to the upstream collecting node instead and there is no effect in the node
all other nodes except end nodes: trade power is applied to move trade value out of the node (direction is determined bynations with merchants present in the node transferring trade)
other end nodes: no effect

In nodes where you have a merchant placed (including nodes directly downstream of your collection points) your trade power is used in the node to collect or to move and steer value out of the node in the selected direction
 
node that is immediately downstream from a node you collect in: a percentage (30% iirc) of your trade power in the node is applied to the upstream collecting node instead and there is no effect in the node
all other nodes except end nodes: trade power is applied to move trade value out of the node (direction is determined bynations with merchants present in the node transferring trade)
other end nodes: no effect

Not quite. Any node that you have province* trade power in will apply an additional 20% of that province trade power to each trade node directly upstream of that node. This is the "transfers from traders downstream" part of your trade power, and it happens even if you have a merchant there. The one exception is that you need to discover a node before propagating trade power this way, so some nodes become worse as the colonizers discover them.

Also, if you don't have a merchant present in a node, your trade power will be used to push trade forward if there is any possible route back to a node you collect in, even if it has to go halfway around the world. If there's not a route back to a collection point, your trade power does nothing but propagate upstream, which is why it gets highlighted in this situation.

*also applies to ship trade power with the right age ability