To map global attributes, 

1. Go to the Magento 2 Admin panel.
2. On the left navigation bar, click the Zalando Integration menu.
   The menu appears as shown in the following figure:
   
3. Click on Attribute Mappings.
   The Manage Attribute Mapping page appears as shown below:
   
4. To add a new mapping, click on Add New Mapping. The page pops to select the category as shown below:
   Select the Zalando Category and click on the Continue button.
5. After selecting the category you will be redirected to the page-
   
6. Now map all the Zalando Attributes with the Magento Attributes.