A method (300) of editing program code is proposed. The program code consists of main instructions written in a high-level language. Typically, the program code further includes one or more sets of service instructions, which are not directly connected to a desired algorithm (such as tracing instructions for debugging purposes, performance measuring instructions, and the like). In the solution of the invention, each set of service instructions is enclosed (321-322) between a pair of predefined comments defining a starting tag and an ending tag. An editor of the program code is provided with commands for automatically disabling (341) the service instructions (converting them into corresponding comments); at the same time, the disabled instructions are condensed (340) on the monitor. Additional commands are available for automatically enabling (368) and restoring (367) the service instructions.