Yes, you can start creating invoices with any number you want. Let's see how it works.
When creating a new invoice, in the right-hand corner of the invoice template you will find a section with several details about this invoice: number, issue date, due date, and payment method. The system fills these details automatically, but you can change them if needed. The Invoice number can contain only figures or a combination of letters and figures. You can also use special characters like "/" or "-".
Also, the system will save the invoice number permanently, and won't allow you to create an invoice with the same number. If this happens, you will be presented with the below message.
In case you need to start the numeration of invoices with 1 with the beginning of the year, it's better to indicate the year in the invoice number. For example, "1/2020".
This way you will always be able to keep the number of your invoices in order without the risk of making any mistakes.