You must have been granted the Resource Request Entry permission control in order to generate resource requests based on project tasks.
Your administrator can configure the process—see
Configuring Bottom Up Planning.
Fields on the project task assignment update automatically to match the resource that is eventually assigned to the . Your administrator can set the
auto-update-pta-with-assigned-resource setting to control this behavior.
Resources who do not have roles matching a role for a project assignment can be included in a list of possible resources to assign to a project task assignment. Your administrator can set the
allow-to-assign-a-resource-with-different-role setting to control this behavior.