In Workato when you add the FOREACH loop on any List, we can configure Repeat mode for that loop processing. Currently, in Workato we can select 'One item at a time' and 'Batch of item' values. But to use 'Batch of items' we need actions that support batch/bulk processing. I am using custom action from a custom SDK connector.
So wanted to know how can I create a Custom bulk/batch processing action in Workato.
yes you can but you need to check whether target application supports the batch/bulk processing. If yes then you have to invoke the source system API with list of records.
Also, once that API is available then you can write connector SDK code. you can refer this documentation to create custom connector https://docs.workato.com/developing-connectors/sdk/sdk-reference.html.