It’s not possible for AdWords advertisers to schedule imports of offline conversions into AdWords on a regular basis.
Offline conversion importing was introduced to AdWords in 2013. Advertisers set up offline conversion events from ad clicks or calls to optimize campaigns based on impact through the entire sales funnel.
After the offline conversions have been set up in AdWords, advertisers can upload a or link to a file in AdWords or send the data through AdWords’ API.
In order to get it set up in AdWords, go to Tools > Conversions, and then click Uploads from the menu on the left and follow the steps. It’s possible to schedule uploads to import daily or weekly.
Last June, Google launched a native conversion syncing solution for Salesforce users.