TAX Reporting clarifications needed

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Hi all

We are starting a project with TAX report - apologies in advance for naive questions, but we have difficulties understanding the following: 

- Consolidate Rule: what is it for? Which rules are executed when we launch this rule? how does it work during the process and why is it needed?

 

- Intercompany Elimination: why should we need this rule if there is no place to script rules or configure eliminations? This rule is executed in FCCS for consolidation purposes. What's the link / relationship with Tax?

 

We want to get our heads around TAX and the above so we understand how they are used during the process.