You can add a time log to your tasks on AccountancyManager to log time and invoice for this is chargeable. 

To do this, go to Tasks. Find the relevant task and select the clock icon to the right as shown below.

A new window for the Task Time Log will open.

You can input more details and client info in the sections. If you are working on the task, you can leave this open and the time will track and update in the Time Spent section, or you can input the amount of time taken and save with one of the options on the bottom right. 

Save & View Tasks will take you back to the Task list.

Save & View Time will take you to the Time list.

Save & New Time Log will allow you to start a new Task Time Log. 

If the task is chargeable, it will add to Work in Progress in the Time section so you can create an invoice.