Yes you can. On top of your bank book and statement showing less than 400,000 baht, passport, marriage cert., etc, the IO will want to see additional documents relating your income earned and paid in Thailand.
1. Work permit - validity up to around the same date that you want to extend your visa to i.e. next year.
2. Thai company commercial registration, current company certificate, VAT certificate, PND50 for past year, PP30 & PND 1 previous 3 months
3. Your PND 91 for past year, previous 3 months SSO payment receipt & details.
These requirements differ from one IO to another, so your local IO may want more or less of the above.
