Auto schedule tasks with over-allocated resources

Hello! Thank you for your quick reply, and sorry for the cross-post. In that case, when a resource has overlapping tasks should I specify the resources availability for that task considering that they have another task (or tasks) at the same time? For example:

Task 1 Breathe

Resource: Player 1 - 50% units

Resource: Player 2 - 100% units

Task 2 Complete Mission 1

Resource: Player 1 - 50% units

How can I control a resource's allocation considering that some days it will be able to dedicate 100% of its time to a task while in other instances when handling multiple tasks simultaneously it may only be able to allocate 50% or less to the same task? Should I specify the available hours for each resource day by day? Or is there an easiest way to approach this?