Daniela Stankova 

I'm going to hazard a guess you just want to know how to use Retrofit.  This is designed for the usecase you have explained in your original post, but only as long as it's a bit of light editing.  It's not designed for heavy changes to the file.

To use Retrofit just make sure your project is active and then run the batch task "Update from Reviewed Target File (Retrofit)".  The description is this:

"Updates the *.sdlxliff files with the changes made to the target documents during review. After the changes are imported, you can review the updates in the Editor view using tracked changes. Optionally you can also check and correct the retrofit results in Alignment view before opening them in the Editor."

That seems to fit the description of what you're looking for.  There' a video here that explains quite well how it works:

If the target file has much bigger changes then the retrofit process might fail.  It's worth taking a copy of your project first and then trying is anyway as it sometimes handles even big changes surprisingly well.  But if it fails then come back and we can try a different approach.

Daniela Stankova 

I'm going to hazard a guess you just want to know how to use Retrofit.  This is designed for the usecase you have explained in your original post, but only as long as it's a bit of light editing.  It's not designed for heavy changes to the file.

To use Retrofit just make sure your project is active and then run the batch task "Update from Reviewed Target File (Retrofit)".  The description is this:

"Updates the *.sdlxliff files with the changes made to the target documents during review. After the changes are imported, you can review the updates in the Editor view using tracked changes. Optionally you can also check and correct the retrofit results in Alignment view before opening them in the Editor."

That seems to fit the description of what you're looking for.  There' a video here that explains quite well how it works:

If the target file has much bigger changes then the retrofit process might fail.  It's worth taking a copy of your project first and then trying is anyway as it sometimes handles even big changes surprisingly well.  But if it fails then come back and we can try a different approach.