How to Add Subtitles Automatically in Adobe Premiere Pro

Step 1: Import your video. By opening Premiere Pro, go to the “Project” panel,
and either right-click the empty space or double-click anywhere in the box to select “Import.”

Step 2: Set the automatic transcript by Click
“Window” > “Workspaces” > “Captions and Graphics” > “Text” > “Transcript” > “Transcribe sequence”
to open the dialogue. Set the language, speaker labeling, and audio analysis. And click “Transcribe.”

Transcribe in point to out point only: Specify to transcribe audio within the marked In and Out points.
Then Merge output with existing transcription: Insert auto-transcription into an existing one between specific In and Out points
to ensure continuity.

Step 3: Create subtitles. By going Under “Transcript,” click the “…” next to the speaker to edit or add the speakers’ names and save;
type in words in the search field and click “Replace” or “Replace All” for a change.

There are other practical uses under the “Text” panel; for instance, you can enable “Spell check” for your captions.
Click “CC” to select a preset, customize the format, stream, style, etc., and hit “Create captions” at last.

Step 4: Check out your captions. Because they are not always 100% accurate, you need to check out the motion array and machinery
and edit the subtitles as needed on the left of the panel. Or, double-click the caption box to open the “Essential Graphics” panel;
you can click “Edit” for more changes, like font, size, subtitle position, etc.

Step 5: Export the subtitle file or video. Move to the “Captions” tab, and click the three dots on the top left;
press “Export” > “Export to SRT File” or other formats to export your subtitles. To export the video,
go to “Export” from the header bar and, configure the file name, location, format, and press “Export.”

Credit : https://multimedia.easeus.com/ai-article/how-to-add-subtitles-in-premiere-pro.html