Planning to use the Zoho Inventory for my Sales Channels (Multiple shopify store, amazon etc.)

Planning to use the Zoho Inventory for my Sales Channels (Multiple shopify store, amazon etc.)

Hello guys,

I'm planning to use the Zoho inventory app to manage my inventory for my multiple sales channels.
Before that, I would like to verify that this will work for us.

I understand that if I integrated my first Shopify channel it syncs all the products as items in the Zoho inventory. Is there a way to sync only a select products? I want to test if this would be in line with our product discount app.

On how our product discount work
- it duplicates our product (making a 2 version of spreadsheet : 1 is original priced products, 2 is discounted priced products)
- it uploads the discounted priced products every monday and thursday (we have 2 days of sale automation)
- upload back the original priced products after the sale

I'm curious on what would happen if the sync schedule of Zoho inventory  and the Product discount sync (importing products takes time) undergo at the same time. 

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Also, how does multiple shopify store integration works?

Scenario:
1. I integrated my first shopify store - it syncs all the products/items
2. I integrated my second shopify store which have the same products with the first one.

Would it just resync the products/items or would it make a duplicate?
If it would just resync the product, what indicator does Zoho app use to detect that it is the same product? Product ID? Product handle?

Looking forward for an input on this one. Thank you.