When racking a number of casks to small pack or bright beer, it would be very helpful to be able to partially ullage the remaining waste beer, representing the lost product left in the cask, and separate from the remaining usable beer in the remaining cask.
For example, today I have racked out of 8 firkins in a variety of small pack and other tracked containers. As a result, I have 43.2l of beer left over. Approximately half of this has been lost as ullage, but the other half is still in a container. Currently I am unable to split this ‘lost beer’, and so I cannot complete the rack out, as it is more than a single cask can hold.