I have been trying to figure this out, but I haven't had any luck, I have an adjustment layer above 9 layers, but I only want it to effect 5 of those layers.
That is not possible.
An adjustment layer applies to the composite of all layers beneath it.
If you want to apply the same effect to several layers, but not all below a certain point in the layer stack, then consider using a single master layer to control instances of that effect on the other layers, with the instances linked through expressions. This is exactly the reason that the Copy With Property Links feature was created.
Thank you very much
Alternatively, you can also place some layers in a precomp and then apply an effect to the precomp layer in the main comp.
By that, the effect only influences the layers in the precomp.