ItCreate 
The ItCreate routine creates an internal table. That is, it creates a control structure for an internal table, and allocates table space for the size and shape you request. The syntax is:
ITAB_H ItCreate(char * name, unsigned leng, unsigned occu, unsigned memo);
This function is defined in SAPITAB.H.
returns handle to a table control structure (ITAB_H), if successful
ITAB_NULL if there is not enough memory available
name
name of the internal table (null-terminated string) which is used to identify the table when tracing
leng
line length for the internal table
occu
occurs-value for internal table (amount of lines being allocated when first appending a line to the table)
memo
Only use heap memory for allocating table lines. This field is for internal use only. Set the parmeter to 0.