You may use TPM for this.
See the following thread:
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I have a win 10 PC with 4 Bitlocker encrypted data disks, all have same password. System disk is not encrypted.
Each time I start windows I have to enter the password for each disk.
Is there a way to automate this, so I just have to enter the password once?
You may use TPM for this.
See the following thread:
Thanks, but my hardware does not have TPM.
I'm surprised it seems to be no solution for this, I guess many windows users have several Bitlocker encrypted datadisks on their computer and want an easier way than having to unlock each of them at a time after a restart.