New to Sage One

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Hi everyone, 

I'm new to Sage One and have some questions that I can't seem to find the answers to or don't know enough about.

Codes - can someone explain codes to me in simple terms please? and if I need to make new one can I just literally go in and make one for anything?

Are all insurances put under the insurance code - van insurance, tradesman insurance, accountancy insurance?

I have put through some Yell invoices (under the marketing code) and matched them to the bank feed entry but they don't appear on the summary graph??

I'm getting a mix of answers when I google for road tax - is it NO VAT or 0% VAT? and does it come under the moter expenses code or something else?

If you have a monthly bank charge that gets taken and then refunded, so overall paying nothing, how do you put this through?

What happens if you have a yearly statement and no individual invoices for monthly payments? Do I make up a separate invoice for each month to match the payments against?

How do you change the code once matched? I go on the purchase invoice and the edit option is not available.

Can I delete a diesel receipt that I put in as 'other payment' and re-do it as a purchase invoice as I have done with all the other diesel receipts?

Any help appreciated :) Thank you.