Q:

Grocery, Product input, weight by price

I'm looking for my Magento store like bigbasket.com
I'm trying to add weight to price but I'm unable to get same as bigbasket.com and I need some solution about how to create an attribute for grocery products and how to manage weights by price? 
For reference I just sending this URL (https://www.bigbasket.com/pd/10000404/bb-royal-sona-masoori-raw-rice-10-kg-bag/) please this and let me know the weighting process for grocery

A:

Create few simple products,one for each weight to price type. 
Now create a configurable product or group product from these simple products. 
Once done you should then tweak block code and .phtml to get values and display. 
As if you look at the reference URL you gave then that display can be considered as a modification of configurable product in Magento.