Hi @Mathew K17 ,
For setting up relationships between tables, you need to use the Link column type: https://help.stackby.com/article/27-column-type-link22
Once you link across tables, you can use Lookup or Aggregation to bring data automatically from the other table.
When you pull information via third party integrations, you can add data in the 'Link column' and it will automatically add it there, link it to the other table (or add a row if it's a new company not there).
Hope this helps.
Some resources might help:
1. Lookup Field: https://help.stackby.com/article/28-column-type-lookup-lookup-count17
2. Sales Pipeline tutorial: