Webservice to load data into external data table

Summary:

Is there a webservice to load data into external data table?

Content (required):

For integrating purposes with compensation plans we need to load data from on prime payroll and attendance system to the external data table as we can not use the standard excel loader.

Is there a webservice to load the data?

Version (include the version you are using, if applicable):

22B

Code Snippet (add any code snippets that support your topic, if applicable):