Link between two script in two different folders

Hello,

I need help... I try to use an exporting project ("Project B") in my project ("Project A") but when I try to put scripts of the "Project B" in the folder where there is scripts of the "Project A", the project don't run correctly but when I put the scripts of "Project B" in the root of my "project A", the project running well.

So I choose to use the second solution but when I do this, I can't use classes of the "Project A" in scripts of the "Project B".

This is my problem...

I take all your ideas(if anyone know how I can use scripts of the "Project B" in the folder where is scripts of the "Project A", this is perfect).

I explain the problem of the first solution : I download assetbundle in an object WWW and when I do that, the www.assetbundle.mainAsset is null if I'm not in the root of project A...

Thank in advance for your future help