Have a look at Localisation: GST/VAT worksheet programming guide
As explained in the above reference; it enables code you generate to be also usable by all other users in your country (instead of only working with your business file).
Again as explained in the above reference, Manager reports these separately for each tax code (based on the context the tax code is used).
The interface Lubos has provided should be easy for you as it is aimed a users with less programming experience but good local accounting knowledge. Note the details are likely to change but very similar functionality is likely to be maintained.
Note the detail of reverse changed VAT may also change at some time see Tax Withholding Percentage - #26 by lubos however these changes are likely to simplify writing localisation using them.
The easiest way is to create a test business and see what happens when you add test entries (in general nothing is reported when no test data has been entered). Doing this also simplifies posting screen shots as only dummy data is shown.
You can also look at other EU countries localisation such as the UK or Netherlands for illustrations of how it is generally handled. However details of local tax laws, accounting conventions and Managers conventions are almost certainly to be the difficult part for non accountants.