Time tracking home made

I would like to custom create 2 columns followed by time. We would need to be able to enter integers in a column and then add them in a sum column, and then reset the first column.

Example :

  1. Time column: 2h

  2. Total column: 2 h

  3. Time column _ returns to zero

  4. Time column + 1
    5. Total column: 3h

  5. Time column returns to zero

In the best of all worlds I would collect the entries Person, current date and numbers entered
Please note this items are in subitems column

I have tried several integrations and none do what I need and are expensive
Thank for your time!