Project-Oriented Procurement (ProMan) supports various business transactions that are related to project procurement. Some of these transactions are:
Stock transfer posting: You can use this transaction to transfer project stock from one storage location to another within the same plant or between different plants.
Generate purchase requisition: You can use this transaction to create a purchase requisition for a material or service that is required for a project.
Cancel goods issue: You can use this transaction to reverse a goods issue posting for a material that was issued from project stock. Reference: https://help.sap.com/saphelp_erp60_sp/helpdata/EN/8e/8bc95360267214e10000000a174cb4/frameset.htm

The system can activate requirements (such as reservations or purchase requisitions) in different ways, depending on the settings in customizing and master data. Some of these ways are:
Immediately, by saving the project: This means that the system creates requirements for all materials assigned to WBS elements or activities as soon as you save the project. This option requires that you set the indicator "Requirements immediately" in customizing for your project profile.
When releasing a network or an activity: This means that the system creates requirements for all materials assigned to a network or an activity when you release them. This option requires that you set the indicator "Requirements on release" in customizing for your network type or activity type. Reference: https://help.sap.com/docs/SAP_S4HANA_ON-PREMISE/4dd8cb7b1c484b4b93af84d00f60fdb8/79ceb65334e6b54ce10000000a174cb4.html?&version=1909.002

To update the degree of processing for an activity, you have to confirm the activity. Confirming an activity is an action that records the actual data for an activity, such as actual start and finish dates, actual work and costs, and actual degree of processing. The degree of processing is a percentage value that indicates how much of an activity has been completed. Reference: https://help.sap.com/doc/0f069b2e08b748f1b480d4c8b46c3c49/100/en-US/6a7a9f0a6e421014e10000000a174cb4.html