You are close but haven’t quite started in the right place.
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I’m not sure which country you are from but first check to see it there is a localisation for your country here Localizations | Manager If so load and use that.
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In the past there were centrally maintained tax codes for most countries, they have now been removed so you will need to create your own. It is best not to start with another countries tax codes because if a later business uses both countries localisations the tax codes will interact (because the underlying GUID will not be unique). To create tax codes see these Guides
Tax Codes: Create and use tax codes | Choose between tax-exclusive and tax-inclusive prices | Work with multi-component custom tax codes | Reverse charge VAT (Value Added Tax) | Archive tax codes | Adjust tax accounting for partial personal use | Account for GST on goods imported to Australia | Implement 2017 GST scheme for India -
You should then be able to enter transactions with your tax codes and see the summary result in: Reports → Tax summary
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To write a localisation for you country (and general a country specific version of the Tax summary report / Business activity statement / PAYGW etc) see How to implement country-specific report in Manager I agree looking at the localisations of other counties first is an excellent stating point as described in more detail here Localizations for Bangladesh - #10 by Patch