What is the exact problem you have?
On that screenshot, I don’t see any RangeStart and RangeEnd fields.
Anyway, can you tell us a bit more about your exact requirement, what are you trying to accomplish?
Also, can you please check the Merge Ranges example and the MergeRanges.docx input file?
The example and the provided input file should demonstrate how to use merge ranges in the mail merge process.
Anyway, your field is named “RangeStart:TYPE_GECISHASAR” which means that the data source you’re providing should have a property named “TYPE_GECISHASAR” that has multiple records.
Also, I don’t see where is your “RangeEnd:TYPE_GECISHASAR”?
The “RangeStart” is at the beginning of the row and the “RangeEnd” should be at the end of that row.
I hope that helps.
If you need more, please send us a small Visual Studio project that demonstrates what you have.
Unfortunately, I don’t know what that left part of your screenshot is.