Project desktop vs Planner + project Plan 3

We are trying to plan our projects using ms Planner Premium (Plan 3). However, I get very confused because of the so many product names, subscription name, soon ending products, etc. my questions are:

• Which desktop tool of microsoft for project planning is running currently. If it's "Microsoft Project Online Desktop Client MSO" can this be synced with the planner premium (Plan 3)?, if yes how?
• I have an excel list of a Project plan with the columns below: can i manage my project in planner premium? if yes, are all this custom fields deployed in dataverse, so that I can access them from power bi?
  

  i have a project plan in an excel file with this columns. now i want to create this project plan in project plan 3, how to do it?

   Company

  Cost Center Name

  Company Number

  Account Number

  Cost Center Number

  Accounting Project Number

  Project Number

  Sub- Project number

  Project Leader

  Concept

  Vendor (provider)

  Total Cost (in contract

  currency)

  Contract Currency

  Project Initiated/Not Initiated

  Committed/Not committed

  Priority

   January, 2026 

   February, 2026 

   March, 2026 

   April, 2026 

   May, 2026 

   June, 2026 

   July, 2026 

   August, 2026 

   September, 2026 

   October, 2026 

   November, 2026 

   December, 2026 

   Q1/27 

   Q2/27 

   Q3/27 

   Q4/27 

  2028

  2029

  2030

• What is the best practice project planning approach when i have complex projects that I have to manage, with resources, costs, projects, sub projects, sub sub projects. How do this on desktop and online? And also colaborative? 
• when project managers have to input thier budgets, how can I create a mapping where they can input thier budgets and project related facts.

Thank you in advance for you inputs and help

F.A