I found a way to mass bulk update and edit split transactions using the Global Search (in the upper right toolbar). Sorry if this is already known, but searching the forums only showed posts saying it wasn't possible. Here is how you can do it in the latest subscription versions on Windows:
- Use the Global search in the upper right to filter to a unique string.
- It will open a new Search Results window
- Notice how it shows "Split #" in the Payee column. This is isolating the spcific split where there was a match.
- Filter your results further by sorting and using range select to select/deselect your target transactions.
- Click "Edit Transaction" button in the lower right.
- It will open a new window again. This time Find and Replace
- Whats different here is it still has each split line isolated
- You can filter the range further here if necessary
- Now you can replace as if these were individual transactions.
Enjoy!