So you need the input field with two options for an item.
Let's look at an example of how to do it:
For example, You need to add field "Capacity" with 2 options: "16Gb" and "32Gb".
1. Go to "Item fields" manager (Components->Iprice minimart->Item fields)
2. Click "New" tool button to create new field.
3. Set the name and the caption of the field, also set the maximum field size
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4. You need to set parameters: "Allow user input" - Yes, "Allow list of values" - Yes. Also you need to set options to the parameter "Default list of values for user input". If you need to set custom additional price for options, then set the list of values like that: "100:16Gb;200:32Gb", where 100 and 200 are the custom prices for each option.
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5. If you need individual list of values of "Capacity" field for one item, then go to "Items" manager. Select an item for editing, go to tab "Custom fields" and set options to the parameter "List of values for field "Capacity"
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Thus, we get the following result in the price list:
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If you use custom price for each option, then you need to use formula for price calculation of the product. See the documentation how to use formula price:
iprice-web.ru/en/iprice-minimart-guide/2...ge/69-using-formulas
If you have any question about formulas, you can ask about it in this thread.