In order to perform the unloading of data from 1C 7.7 trade and warehouse in 1C: Accounting 8.2 you need to perform
1. Go to your working base 1C: 7.7 Trade and warehouse
2. Select the tab Service-> Unloading in 1s Accounting-> To Accounting (the version of which you are using)
3. Select the time period you are interested in.
4. Check the boxes you need for what you want to unload from 1C 7: Trade and warehouse
5. Select the path where the uploaded data will be saved.
6. The resulting * .xml file is your data that you can upload to 1C: 8.2 Accounting
Thus, the data is unloaded from 1C 7.7 to 1C 8.2.