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Full subrelations are enabled on all conversion reports, so you can break down any eVar by another eVar. The Breakdown By menu in the report table matches the standard Analytics reporting menu, keeping selections consistent
To help illustrate how subrelations work, consider the following example:
If you pulled a Tracking code report, you would see the following:
If you pulled an eVar1 report, you would see the following:
If you subrelated the Campaign report by eVar1, you would get the following:
If you subrelated the eVar1 report by Campaigns, you would get the following:
Due to the persistent nature of conversion variables, there are two data columns used to store eVar values; the value that is fired, and the value that persists. If we were to look at a raw data export for this example, it would look like this (simplified for this example):
Our backend works by allowing post_campaign and post_evar1 to persist the values defined in campaign and evar1. Subrelation reports specifically only look at the hits containing success events (rows highlighted in light yellow). They then populate the subrelation reports based on the persisted values (in this case post_campaign and post_evar1, cells highlighted in bright yellow).
In essence, subrelations follow these steps to populate your report: