I didn’t understand your question clearly but I’ll give you my opinion,
When you click on the checkbox of any data column from your data side section, it will insert a new table containing that column without the need of inserting a table visual then adding the data to it. (Make sure you’re not selecting any visuals in your report before clicking on the data to add it).
So If you’re not selecting any visual, and clicked on the actual hrs cost from the data section, Power BI will insert a table that has that data and a summation of it based on the data type, if the data was numbers the default summarization will be sum. You can change it later to whatever you want.
But If you’re already selected a certain table in your report and then clicked on a data column from the data section, it’ll be added to the table and summarized also.
So if the table that you already have is satisfying you and it’s showing the data you want it to show, that’s ok.
If you want to focus on the actual cost and show its sum alone in a separate table, it’s ok and you are free to do whatever you want as long as the data is correct and clear and useful to the stakeholder.
If you still have any question feel free to reply to this post.