I am not sure I understand you correctly. Here is an attempt for an answer:
On a category page, you can also place a link to the corresponding forum category. With every subcategory, you can place a link to the corresponding forum subcategory.
One thing though: there is no such things as related categories on the forum side (GForum does not support that at the moment). And there is no such thing as a forum being in two categories (a link can be in two categories, but again GForum does not support this at the moment).
Ivan
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Iyengar Yoga Resources / GT Plugins
On a category page, you can also place a link to the corresponding forum category. With every subcategory, you can place a link to the corresponding forum subcategory.
One thing though: there is no such things as related categories on the forum side (GForum does not support that at the moment). And there is no such thing as a forum being in two categories (a link can be in two categories, but again GForum does not support this at the moment).
Ivan
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Iyengar Yoga Resources / GT Plugins