I have a field in search time :
| eval Volume = (QuantityA + QuantityB)
How can I let this automatic, so I can just use Volume instead of creating this eval field for each query.
You can define calculated fields as mentioned in the link below. Whatever you put in EVAL can be used here.
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You should be able to do this in your conf files, transforms.conf and fields.conf and props.conf
Take a look here, looks like somebody's already answered that question;