@Venkata satyanarayana Machari veera (CIS) - Welcome to Microsoft Q&A platform and thanks for using this forum.
Application Insights application has a fixed set of tables. You can't configure other data sources to write to the application so no additional tables can be created. Please refer to this documentation for additional reference.
However, please be informed that you can create custom tables using the Data Collector API with in Azure Log Analytics workspace and send your custom data.
You can use cross-resource log queries in Azure Monitor to query both Application Insights and Log Analytics data with in Log Analytics workspace. Please see if this fits your scenario.
Hope this information helps. Please revert back if you have any further queries. Thank you