Explain how to set up ad customizers for multiple ad groups in Bing Ads.

Setting up ad customizers for multiple ad groups in Bing Ads (Microsoft Ads) allows you to create dynamic, personalized ad content that adapts to various conditions, such as user search queries or time-sensitive promotions. Here's how you can set up and manage ad customizers for multiple ad groups effectively:

### **1. Understand Ad Customizers**

Ad customizers use dynamic parameters to insert custom data into your ads. You can use them to display information such as product details, prices, promotions, and countdowns. For multiple ad groups, you'll create custom data that applies to each ad group's specific needs.

### **2. Prepare Your Custom Data**

1. **Create a Business Data Feed (if applicable):**
   - If you're using complex or varied data across ad groups, consider uploading a business data feed.
   - Format your feed to include columns for attributes such as `Product Name`, `Price`, `Promotion`, and `End Date`.
   - Go to **"Tools"** > **"Business Data"** in Microsoft Ads and upload your feed.

2. **Define Custom Parameters:**
   - Create custom parameters relevant to your ad groups. For example, you might use parameters like `{=ProductName}`, `{=Price}`, or `{=Promotion}`.

### **3. Create Ad Customizers**

1. **Navigate to Ad Customizers:**
   - Go to the **"Ads & extensions"** tab and select **"Ad customizers"** from the navigation menu.

2. **Create a New Ad Customizer:**
   - Click **"Create ad customizer"**.
   - Define your custom parameters based on the attributes in your data feed or manually set parameters.

3. **Set Up Custom Data:**
   - If using a business data feed, link your custom parameters to the columns in your feed. For instance, you might use `{=Feed.ProductName}` to dynamically insert product names into your ads.

### **4. Apply Ad Customizers to Multiple Ad Groups**

1. **Create or Edit Ads:**
   - Go to **"Ads & extensions"** and select **"Create ad"** or **"Edit"** existing ads in the ad groups where you want to use customizers.

2. **Insert Custom Parameters:**
   - In your ad copy, insert the custom parameters you defined. For example:
     ```
     "Save 20% on {=Feed.ProductName}! Ends on {=Feed.EndDate}."
     ```
   - Ensure that the custom parameters are correctly referenced and will dynamically populate based on the data feed.

3. **Apply Customizers Across Ad Groups:**
   - To use the same ad customizers across multiple ad groups, copy the ad with customizers and apply it to other ad groups, or create similar ads with appropriate custom parameters for each ad group.

### **5. Review and Test Ads**

1. **Preview Ads:**
   - Use the preview tool to check how your ads will appear with the custom data. Make sure that the dynamic content displays correctly.

2. **Save and Submit for Review:**
   - Save your changes and submit the ads for review. Ads with customizers might take a few hours to be approved.

### **6. Monitor and Optimize**

1. **Track Performance:**
   - Monitor the performance of your ads using metrics such as CTR, conversion rates, and engagement. Use the reporting tools in Microsoft Ads to analyze how well your customizers are performing.

2. **Make Adjustments:**
   - Based on performance data, adjust your custom data, ad copy, or custom parameters as needed. Ensure that the custom data remains relevant and up-to-date.

3. **Test Variations:**
   - Conduct A/B testing with different custom parameters or ad copy variations to find the most effective combinations.

### **Summary**

Setting up ad customizers for multiple ad groups in Bing Ads involves creating custom data feeds or parameters, applying these customizers to your ads, and managing them across ad groups. By defining relevant parameters, applying them effectively, and monitoring performance, you can create dynamic ads that engage users and drive better results. Regular updates and optimizations ensure that your customizers continue to meet your advertising goals.