How to revert the Transferred status in Project asset to Pending in project asset?

Summary:

1. We have transferred few lines from Project assets to Fixed asset, though they are not posted yet in fixed asset module. We want to revert the changes, that is bring those project asset lines to "Pending" status again. In order for them to be transferred later. Also, to be noted that the asset number has been generated once and we are talking about the new lines which have been transferred.
2. We had one asset under "Manage Capital Projects" and it got automatically assigned to the new asset lines generated instead of keeping the asset name as "Pending without assignment". Is there any way to stop this automatic assignment of lines to the asset header/asset name when there is only one asset header created?