_WPERP Accounting_ diverse customisation & pluggins

WPERP Accounting_ parameterisation & help Details: Our company started using WPERP a month ago and we are having several parameterisation problems (and basic problems): - tax parameterisation - Introducing purchases, expenses and sales with taxes - ... other customisation -pluggins integration Several basic things... But I need some one who helps me to solve it and at the same time teach me how to do it correctly in the future. Main milestones as previously mentioned: A- DIVERSE PARAMETERISATION 1. Tax + product correct parameterisation We have created 5 different types of tax. As per Spain and our activity these are the ones we need and use: When you read "repercutido" is the tax used when we SELL When your read "soportado" is the tax used when we BUY We would like to use these type of tax when we note down our transactions as: - SALES - EXPENSES - PURCHASES We are having problems with it It could have something to do with the "Products" site, but we don't know how to fix it or parameterise it. 2 - IRPF or PIT (Personal Income Tax) Parameterise the diverse types (usually 7% - 9% - 15%) to add them when entering invoices from providers 3 - Salaries Enter Salaries correctly assigning the costs 4- Chart of Accounts Can we erase the default accounts? We won't use them Is it necessary to fix it? How will it relate with the transactions? How to parameterise with them? B - Useful plugins: PDF Invoice Extension + Payment Gateway (integrate with ERP) + Woo Commerce ( build and integrate with ERP)