How to merge 2 TM backup files to a new TM drive?

I have 2 MBPs with 2 external drives for TimeMachine backup. I bought a new 2T external drive recently and I want to merge the backup files on the 2 TM drives to the new big external drive. So I can use one external drive for 2 MBPs backup and free the old external drives. I have copied one TimeMachine backup files to the new external drvie. While I copied another TM backup files, It showed that the Backups.backupdb cannot be modified. What can I do?

What is confusing to me, and perhaps others, is when you get the backups on the new drive, do you want to have two separate backups or one combined backup? Below is a screen shot of a hard drive with two separate backups on it. Is this what you are trying to do?

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