How can I transfer funds into a different EB-5 project account?

It depends on the project structure and documentation, but the safest way to handle this is always to re-file an I-526 petition.

It is unlikely that the I-526 has been filed with USCIS if you do not have a project. If it has not been filed, you need to authorize the regional center in a written letter to withdraw the money from the escrow account of the project you initially subscribed to and transfer it to the new project. Without further details, I would strongly suggest retaining counsel to confirm the status of the project and your investment.

As long as the path of funds is clear and there is a documented paper trail of your funds from one project to the next project, I do not see why the funds would have to be returned to you first.

I do not know how your I-526 petition could have been filed unless the regional center already allocated your funds to a specific project and that was the project contained in the I-526. It does not make sense that they would tell you after the petition was filed that that project was full. You would have to file a new I-526 petition if you invest in a different project then the one listed in the I-526.

You should be able to trace the money from where it is sitting in the bank account into the bank account of the new project.

I believe that as long as you can show the connection of the funds being transferred from one project to another, you should be alright.

I think there is a miscommunication. Please hire an attorney. If the project was full, then your first I-526 was never filed. However, if the first I-526 has been filed that means you are a part of the first project and do not need to file a second application. I am not sure how a regional center can turn around and tell you that the project is full after your I-526 has already been filed. There is a difference between remittance of money and filing of I-526. If your funds were sent to an escrow account, but your I-526 was not filed, then the funds can be transferred to a new project. Please make sure the source of funds documentation explain the entire trail of funds to the new project.