How can i have different type of quantities

-- HikaShop version -- : 3.3.0
-- Joomla version -- : 3.8.0

i have e-commerce which is going to sells fruits online , now i want to know how can i have different type of quantities ?
for example i want to sell apple by Kg & g with different prices for each quantities, and i want different quantities be visible on hikashop_product part.

Hello,

Checking the "How to sell products by Width and Length ?" section of our FAQ will probably help you :
www.hikashop.com/support/faq#cart

so in this way how can i be able to set different prices for different quantities ?

What you can do is this:
Modify the plugin to calculate only with the width.
Install and activate the plugin.
Create a custom item field (business edition) with the column name width via the menu Display>Custom fields so that your customers can enter the weight they want in that custom field on the product page.
It should then work like you want.