How can I link lists across subsites ?

Regular Visitor

Hello,

 

I have some subsites with several lists and I would like to link these lists together.

Exemple : 

  1. Subsite 1 : "Projects" with a list of all of the projects and a column "N°PROJECT"
  2. Subsite 2 : "Customers" with a list of all of the customers and a column "Name-of-Customers"
  • I would like to add a column "Name-of-customers" in the List "Projects"
  • I would like to add a column "N°Project" in the List "Customers"

I already find the function "Create Cross-Site Lookup Site Column in SharePoint" Link 

but in my exemple, the subsites are on the same level and the lists too...

 

Please help me... I'm looking for a solution (or I will have to put all of the list on the top level.... and I don't want)

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