Inventory Tracking

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New to book keeping and new to dealing with inventory... I'm confused how we deal with inventory tracking in sage 50 Canadian edition. I set up our inventory module and added inventory items successfully. For each item, it asked me to link an asset account - which I did. But the problem I'm facing now, is that now that that asset account is linked to particular inventory items, I am not able to post purchase invoices to those accounts.. 

We have a bottled product. If I receive a purchase invoice from the manufacturer, for example, I would want to code it into the asset account, because it is not an expense, its an asset, but now that the account is linked, I cant post to that account... Do you have two asset accounts for inventory? One linked and one not linked? What do you do with other purchase invoices for inventory? With our example, I would want to code the manufacturing, bottling, labelling etc all to the inventory account so that I know the true value of the asset, does that make sense? 

Thanks for your help in advance!