[ic] total adjustment upon item cancellation in admin

[Steve Bourg]

Hey All,

I've built a few sites off of the construct & foundation demos pretty
successfully (yay!).  One of the not-yet-complete features of the admin is
that the order's product total, shipping total,
tax total, and grand total are not adjusted when an item within the order
has been
cancelled.  This is confusing customers when the updated emails go out
and also gives the burden or manual recalculation to the merchant.

I'm aware that the various areas of the demo and admin that reflect
these
calculations pull from a single transactions record vs. recalculating the
line items from the orderline table.

I would like to be able to update the transactions record when a
transactions line item is set to a cancelled status.  I've been told, and
it appears that the calculation functions are dependent upon the use of
carts.  I hope to approach this by simply sending the pertinent aggregate
info needed to calcuate (weight, size, product total, etc for
shipping) without recreating a cart within the admin.  Can anyone guide me
on the approach and/or direct me to documentation for this?

Thanks,

Steve Bourg