There are a few ways of managing bids for product groups in shopping campaigns using Optmyzr. Based on your requirement, you can choose one or a combination of the options mentioned below.

This tool simplifies CPC bid adjustments for Shopping ads by letting you filter product groups based on performance metrics like ROAS, clicks, or cost, and then change bids in bulk. You can use one of the preset filters or create your custom filters to target specific product groups. All biddable items across your account are shown on one page, and you can apply bid changes directly to Google Ads with a single click. Read more about this tool here.

This tool gives you more control over Shopping bids by letting you aggregate and analyze performance by product feed attributes such as color, size, sale price, or item group ID, even if those attributes aren’t part of your campaign structure in Google Ads. It’s especially useful for GRIP (groups of individual products) setups, where you can use these insights to automatically adjust bids for product groups that contain high or low performing attributes, without needing to restructure your campaigns. Read more about this tool here.

This is perhaps the most versatile tool we have to manage bids. It lets you change bids for product groups, keywords, and ad groups based on performance. It gives you a lot more flexibility in terms of comparing performance and also when setting bids.

For example, you can change bids for product groups that have a lower ROAS than the ad group average and then choose to set the bid using your target ROAS and conversion rate. To get started, you can use one of the pre-built strategies (templates) to bid by target ROAS. It also offers advanced options that let you use external data, like sales or profit margin data, to make bid changes in Google Ads.

You can also use the 'Reduce Bids for Expensive Product Groups' prebuilt strategy to reduce bids for product groups that have a higher CPA than the typical product group in the campaign, or product groups that have no conversions despite having more clicks than typically required to get at least one conversion in the campaign. This strategy is compatible with Standard Shopping campaigns running on Enhanced CPC.

Read more about the Rule Engine here.