Batch update Sales Channels with .csv?

[gs3]

Hi all,

Is there a way to batch modify/assign products to particular sales channels?  I know I can do this in each product individually, but in Shopify's .csv template there doesn't seem to be a column for this.

I have 28K products that unfortunately ALL sync'd to a Google Merchant Account (for YouTube) I set up, when I was hoping to be able to only tell Google specific products I wanted to promote/sale through their account.  Right now, all 28K products are showing up in my YouTube Channel, when I only want specific ones.

It would be nice to be able to batch designate the Sales Channels for all my products so that Google ignores the ones I don't want sync'd.

Anyone know if this is possible?  Or anyone have experience with this that might be able to help me?