Please pay attention to the "order of operations" posted earlier.
Fields from a previous step are available in subsequent steps except for calculated fields (they run in parallel), so,
If you configure either an inline field extraction, or an additional Transforms that is executed first, then you would be able to use the field.
E.g
props.conf
[sourcetype]
EXTRACT-list = regex_to_extract_the_list
REPORT-ip = ip_from_list
transforms.conf
[ip_from_list]
MV_ADD = 1
SOURCE_KEY = list
REGEX = c=IN\sIP4\s(\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3})
FORMAT = IP::$1
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