Is it possible to modify the percentage of a reduced timetable?

Yes. It is possible to modify the percentage of reduction in working hours provided that is communicated with the enough advance notice both to the managing entity and to the company. This way, the financial assistance will be able to conform to the new percentage requested and, also, the company —in the General Scheme— it will be able to inform to the General Treasury of the Social Security of the change in the reduction in working hours.