Question about installing OpenCore Legacy Patcher on external hdd partition

Is it possible to install OCLP on an external hdd that have been partitioned? Say for a 1tb hdd, 700gb is used for non OS related file storage and the remaining 250gb or so for installing OCLP. I am really confused about how about doing this as the guides that I have seen recommend using a fresh disk for installing OCLP as the installation process will format the desk. I am assuming the OCLP will completely nuke the hdd including that 700gb partition? So is it even possible to install OCLP on just that empty partition of the hdd? I really don't want to wipe the entire hdd just to install OCLP.

submitted by /u/OceanRaver
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