change time profile

Is the business looking to change from monthly (standard), calendar reporting to weekly or both?

i have months within standard

Are you asking if you can change the current Standard time profile to 5-4-4 from its current setting?

OR do you want weeks to show up in the Time dimension? (e.g. 2024W26)

If it's the former, the Fiscal Year Month Type setting affects any apis that return the number of days in the period (e.g. api.Time.GetNumDaysInTimePeriod). So any rules or member formulas using them would be affected by changing it to 5-4-4, including the calculation or consolidation of historical periods.

If it's the latter, you'll need to create a new application because a time profiles must be created prior to the application being set up. You could use the old application as a data source for the historical monthly data and load that into the new application to a Scenario defined with a Monthly Input Frequency.