If you’re coming from another platform, you could certainly import a trial balance if you have one available. This can be done through Account Settings >> Import Data >> Import Trial Balance.
The suspense account (9998) holds funds that the system don’t know what to do with. What you would need to do is journal them. So, let’s take an example of £500 coming into your current account. As soon as you enter it as an untagged transaction, it creates its balancing entry in 9998 as it doesn’t know where it came from. Chances are, if you have money coming in, it’s from an invoice, so tagging it to a sales invoice balances that out.
If you have other balances, let’s say £25,000 profit from the last few years, you could tie this to 3101 Retained Profit & Undistributed Reserves.
The easiest way would be to import the trial balance if you can get one. Please let us know if you need any help with this.
Hope that helps, but please don’t hesitate to reply if you need further help