The debate is, so if we put buttons as links to online.abc.com from abc.com, would we loose link juice as Google considers sub-domains as different websites? So in that case do we need to put links back from online.abc.com to abc.com? For example, customer visits page abc.com/business-cards and from there when clicks on "Order" button they are redirected to online.abc.com/business-cards. So in this case, do we need to have link on online.abc.com/business-cards back to abc.com/business-cards to make sure that link juice is balanced?
I know that ideally would be to set-up SAAS on the main domain and have all the product pages re-created, the problem is that there are a lot of products and that would take a lot of time to set-up all products, on top of that SAAS has to be launched on a domain and is hosted at the other companies servers, so it would be hard to control it.
How would you structure your links or redirects to a sub-domain pages without affecting main domain pages?
Any suggestions are welcome