By changing the Logical Size of the "specific" table. After 
changing table size, you need to update schema.

if it is required for metric to calculate from a particular 
table in report, you can try changing the "level"  in the 
merics.
 or by using relationship filter also can direct to a 
particular table ,based on the requirement.

modifying the logical table size is a good idea, but it can 
affect all reports which depends on the attributes defined 
on the same table.

In addition to above answers, you can force a fact to take 
data from the required table only