To define a price for reservation of place we must access to:
Planning → Sport school → Courses/Schools.
Once we have entered, we will click on the icon 
of the school in which we want to define a price for reservation of place:
Now we will go to the Additional Data section and once inside the section, to the Web Preinscriptions tab:
Here we must define if there is Payment for reservation of place.. If there is, it is defined whether it is part of the tuition amount or if it is collected separately and then deducted and in Amount the amount to be paid is defined.