Note: There is no native "Import" button on YouTube. You have two options here:
You will use Google Takeout.
Best for: People who want a permanent, verifiable backup and don’t mind a small learning curve. This is the only method officially supported by Google. Note: There is no native "Import" button on YouTube
Google Takeout is the data liberation front door. It allows you to download everything Google knows about you—including your YouTube subscriptions.
This is the most obvious method, but it is only recommended if you have fewer than 50 subscriptions. This is the only method officially supported by Google
Best for: Users who are uncomfortable with extensions or have fewer than 50 subscriptions.
Before Google Takeout was polished, power users used RSS (Really Simple Syndication). YouTube provides an RSS feed for every channel’s uploads. You can use this to bulk-import into a new account via an OPML file. This is the most obvious method, but it
Step 1: On your old account, go to YouTube and scroll through your subscription list (click "Subscriptions" on the left menu). Step 2: You need a website or app that converts a list of URLs to an OPML file. (Search for "bookmarks to OPML converter"). Wait, this is tedious. Honestly, this method is largely obsolete now that Google Takeout exists. It requires manually copying each channel URL. I do not recommend this for more than 10 channels.