To transfer files between two accounts on your macOS computer, first move the files from one account into the Shared folder. Then, log into the other account to retrieve the files from the Shared folder.

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1. Move files to the Shared folder:
   1. Save the files in your current account.
   2. With the Finder active, from the Go menu, select Go to Folder....
   3. In the window that opens, in the 'Go to the folder:' field, type /Users/ and click Go.
   4. In the window that opens, look for the folder named Shared. Drag your files onto this folder so that you can access them from the other macOS account.
2. Log into the other account and retrieve your files:
   1. From the Apple menu, log out of your current macOS account. When the login screen appears, select the macOS account to which you want to transfer the files, and log into it.
   2. In the new account, with the Finder active, from the Go menu, select Go to Folder....
   3. In the window that opens, in the 'Go to the folder:' field, type /Users/ and click Go.
   4. In the window that opens, look for the folder named Shared. Drag your files out of this folder to finish transferring them to the new account.

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The following may be more to your liking. I am assuming your 'main Mac id' is the admin account.

1. From your main account open finder and locate the user account for your pc files. (Macintosh HD/users/pcfiles)
2. Right or control click on that folder and select Get Info.
3. Under sharing and permissions click on the lock icon to unlock permissions. Give admin password when asked.
4. Once unlocked, click on the + button and add your main id to the user names
5. Set your permissions to Read & Write.
6. Click on the gear icon and make your main id the 'owner' of the folder.
7. Click on the gear again and apply to enclosed items.
8. Click on the lock icon to re-lock the folder.

2 Accounts Macbook

Your main id now owns the pc files. You should be able to move files or folders to your main id file structure (no need to copy) or just access them as is. You could import directly into iTunes or iPhoto etc.