will be possible to give authorization with Hierarchy node variable

Hi

I have 1 Hierarchy

corporate

   Region

    country

     Site

      Plant

This is single Hierarchy

There are 80 sites and 16 countries and 4 regions available in my hierarchy

now I can activate hierarchy at bex for this infoobject

for site level users I need to give access only Site and bwlo nodes

for country level I need to access country and below levels

If I create hierarchy node variable, how the solution is possible.

in RSECADMIn I can select Hierarchy and node physically for each site  88 times I need to control for 88 sites?

is there any other solution to do better authorization in my case?