To edit your Chart of Accounts globally (for all companies) in accounts production. Please note that you can have different charts of accounts for Limited Companies, Sole Traders, Partnerships, and LLPs.
If you want to edit the chart of accounts for one company please follow this link.
Navigation: Accounts Production >> General Settings >> Chart of Accounts
Once you navigate to general setting and then chart of accounts. You will see the chart of accounts per each category. You can add new accounts to each category as shown below. You can also edit the pre-existing accounts using the action drop down menu as illustrated below.
Alternatively you can also follow the below link where you can add the desired account for all the clients in one go at a global level.