---
title: Reducing Polygons in Rx Shapefiles
description: Precision Planting, Blue Vantage, Gen 3
---
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# Reducing Polygons in Rx Shapefiles
## Displays, such as Precision Planting's Gen 3 and Kinze's Blue Vantage, will only accept a certain number of polygons. Here is how to reduce the number of polygons in SMS.
- Import your shapefiles into SMS as Planting Prescriptions (if you bring these in as "Generic" and change them when you save the fields, this WILL NOT WORK!)
- Select a prescription and click "Create Map".
- Click the "Edit Layer" button.
- Once in the Prescription Editor, in your "Select Types"section, choose to **Select Objects** and then choose the option of **Select by Legend Range** in the "Action Tools" section.
- 
- Select one of the ranges with the tool and then use the **Merge Selection** in the "Edit Tools" section.
- Continue to merge the different areas of the field until satisfied.
- If you wish to check how many polygons are now in the shapefile, click the "Data Grid" tab in the upper left-hand corner.
- You can see how many rows/polygons are now in this prescription.
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