Your POS (Tiller) is the source of all information. So if you want to offer products with options online, create this setup first in your Tiller back office, then sync with Deliverect, adjust the menu, and publish the menu.
Follow the steps below to create modifiers and upsells.
Create modifiers & upsells
Step 1. In Tiller, go to Products then Options in your sidebar.
Step 2. Select New Category and create the category. For example, "Choose your Burger".
Step 3. After this, you will need to create the modifiers that go inside that group.
Add created modifiers to your products
If you go to your Products list, search for the product you want to add a modifier. The settings for this product will appear. Scroll down until you see "Extras and options" and choose the modifier that you want to use. Don't forget to save!