Merge Lines with Same Time Codes
Merge consecutive subtitle lines whose start and end times are (almost) identical into one entry that combines the texts.
- Menu: Tools → Merge lines with same time codes…

Options
- Max ms difference — Maximum difference in start and end times that still counts as “same time codes”
- Make dialog — Format the merged text as a two-speaker dialog (using the dash style from General settings)
- Auto break — Re-break the merged text into balanced lines
The preview updates live; uncheck any group in the list to exclude it before clicking OK.