How to add a partition of Sierra to my mid-2015 MBP running High Sierra?
Hi
How can I add a partition of Sierra to my mid-2015 MBP running High Sierra?
best
elmer
MacBook Pro
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Make a current backup of your current system.
Use Disk Utility to create a second partition on the disk drive.
You will need a copy of the Sierra installer - How to upgrade to macOS Sierra.
Install Sierra on the newly made partition.
Disk Utility for Mac- Partition a physical disk using Disk Utility
Using macOS Sierra Disk Utility to Partition, Erase Drives