Depending on your underlying Messaging platform , there are several free Add-ons to choose from.
These will allow you to capture and index messages(ie: from queues and topics) flowing around your enterprise. You can then write your own searches and visualizations atop this data.
JMS Messaging Modular Input
AMQP Messaging Modular Input
Kafka Messaging Modular Input
MQTT Modular Input
ZeroMQ
Stomp
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I think you're trying to describe a join:
source=Apple.csv | join A3 [source=Orange.csv | rename O1 as A3] | table A1 A2 A3 O2
Usually joining isn't the Splunk way. Depending on your actual use case there may be much better ways.
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