Hi
Could you please use following structure of your documents:
-Your Documents
---Type 1
---Type 2
---Type 3
In Your Document you will need to use your 3 repeaters and for displaying random document you can use
random document webpart. You will need to set Document type, Path and Transformation which should be used.
You can set visibility of this webpart to be displayed only on this document using following macro:
{%cmscontext.currentdocument.documentname == "Your Document"%}
So this random product will be displayed only on Your Document page.
Each of Type 1, Type 2, Type 3 pages will inherit content of parent (3 repeaters) + add repeater webpart that will display only documents of type 1 or type 2 or type 3 on each document and set Path to . (actual directory).
You can find inspiration in Kentico
CMS Corporate site (please look at Products documents).
Best regards,
Ivana Tomanickova