You can offer a set of variations for your products such as color, size, material. So instead of creating a unique listing for each variation of the same product, you can use product variations. You might also want to set a different price for each variation. To do this, simply go to your shop page and choose your product. Click the Add Variation button and fill in the information that is essential for the product variation:
Title: Set a title, for example: Size.
Add Option: If the variation is size, you can add different sizes by clicking on Add Option and input the size options.
Price Variation: This is the area you set the price difference o the options you have added. To set a price difference, for example, +50. This will make this specific option 50 (USD) more expensive than the default price. You can repeat the above steps to add all the options and price variations.