/* a pointer to the I_WANT_MORE_SKILLS struct will be saved in this entity skill */ 
#define _MORE_SKILLS 99

typedef struct I_WANT_MORE_SKILLS
/* this struct implements additional entity skills */
{
	var skill[100]; // 100 more vars
	void *data; // arbitrary data
	// ...whatever
} I_WANT_MORE_SKILLS;

action your_entity() {
	/* creating a new struct and saving it in the entity skill */
	my.skill[_MORE_SKILLS] = (I_WANT_MORE_SKILLS*)malloc(sizeof(I_WANT_MORE_SKILLS));

	/* access the struct */
	((I_WANT_MORE_SKILLS*)my.skill[_MORE_SKILLS]).skill[0] = 876; // set value
	var get_var = ((I_WANT_MORE_SKILLS*)my.skill[_MORE_SKILLS]).skill[0]; // get value
}