Yes, with two caveats:
- None of the selected transactions may have splits -- you can't have splits on a transfer, so if any of the selected transactions have a split then 'Transfer' is not an option in the 'Type' field.
- You need to do this in the 'From' account, i.e. you only want to change withdrawals to transfers, not deposits to transfers. There is only an option to select a 'Transfer To' account, not a 'Transfer From' account.
You can simply:
1. Select any number of withdrawal transactions.
2. Right click and choose 'Edit Transactions...'
3. Click the checkbox beside 'Type' and choose 'Transfer' from the dropdown
4. Click the checkbox beside 'Transfer To' and choose the target account
5. Click 'OK