How to use two or more Rates for a single resource

Using P6 Stand Alone, ver 18. 

I need to have 2 or more rates for a single resource, without overwriting the previous rate(s). For example, my resource is named John Doe. He is a pipefitter and his current hourly rate is $41.50/hr. He is assigned to 3 activities A (10 days) ,B (20 Days) , and C (20 days) , respectively (FS=0). From 7/19/21 thru 8/13/21 his rate is the original $41.50/hr. On 8/16/21, his rate changes to $42.00/hr. Activity A is complete (7/19-7/30/21); Act B is 50% complete (8/2/21 - 8/27/21) and Act. C hasn't started (8/30-9/24/21). Can the original rate still be