Give me your suggestion for internal linking of e-coomerce and directory type sites.

I have a directory and e-commerce site like examplemanufacturers dot com, its have four section eg 1)manufacturers 2)suppliers 3)exporters 4)Indian manufacturers. these all section have same categories like agriculture, apparel & fashion, real state etc, I am confused regarding internal linking. can we use cross linking b/w same categories different section or section specific linking useful b/w same categories, try to all section target or try to one section ranking improve please give me…
Give me your suggestion for internal linking of e-coomerce and directory type sites.

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