It’s not possible to import historical sales data into Breww at the moment, sorry.
If you wanted, you could manually create invoices for previous sales (maybe one per month) to give Breww some context of historical sales, but I’m afraid it’s not possible to do a bulk import/upload of this sales data. If you do this, you need to be careful that you don’t cause problems with your stock levels and duty. Breww can start to pick up on sales rates of products quite quickly for forecasting, so to be honest, this may not be worth the complications.
We’ve already got Manually set expected sales rate in Stock availability forecast on the requests list, so I’m going to close this for now as they’re both looking to achieve a similar aim 