Products can be posted from the Website properties page individually (Action Menu > Post to Shopify) or from the Manage Inventory page in bulk (Launch to Channel > Website).
You can post variations from SellerCloud to Shopify. Set up the Matrix in SellerCloud and post the Matrix Parent.
Please note: Shopify only allows three options per variant. This means that a product variation can have a color, size, and material, for example. It will not support a 4th value.
Read about Shopify inventory and pricing updates here
Shopify Product Visibility
You can control the item visibility on Shopify from SellerCloud.
On the Website Properties page select "Online Store" from the "Visibility" field to make it visible on the webstore and in the Shopify POS. The post the item. All other options will make the product now visible.