How can I manage sales tax calculation issues in Shopify admin?

[ibear888]

We sell items that do not easily fit the Product Categories. We sell items that we do not necessarily ship to the purchaser's home address.

When adding an item to a sale in shopify admin (edit a sales order), shopify is not computing the correct tax for that item (before or after clicking Update Order).

Is there an "easy" way to manage these issues?

thanks,

Jeff