Substitute & get randbetween from cell reference

Hello guys,
I have the randbetween value in a cell and the multiple value in the other cell. I want to get values with the help of randbetween formula in cells H2 to H15. I want the formula to select the randbetween amount from the cell B2 and the multiples value from the cell C2. How do I combine the above 2 formulas into one and get the result?
If , in the B column, I write the value as 6-10, it is not accepting in the general format. Since, multiples is used in most of the cases, I would like to know how to enter 6-10 or directly 6,10 which also is not accepted by excel in the required format. Something like this '=RANDBETWEEN(SUBSTITUTE(B2,"-",")*C2 but it ain't working.

This ??

=RANDBETWEEN(--LEFT($B2,FIND("-",$B2)-1),--MID($B2,FIND("-",$B2)+1,255))*C2

OR

=RANDBETWEEN(--MID($B2,1,FIND("-",$B2)-1),--MID($B2,FIND("-",$B2)+1,255))*C2

Can you please also tell me the solution for the second problem." I am not able to enter the range between 6-10 in any cell. It gets converted into a date by default. At times, I need the range between 60-100 in multiples of 10 like 60,70,80,90,100 but if enter 6-10 it is not displayed in that format.

Using 2 separate fields is a good idea HansDouwe. But when I enter the range as 6 and 10 in place of 60 and 100 I am getting the result as 10 in all the columns. I need random figures between 60 to 100 like 60, 70, 80, 90 and 100. Actually it is a very good idea. I added a few more valued in rows 5,6 and 7 and extended the columns to 5,6 and 7 to get the result. I can auto extract values of any number of rows at once. The only problem is that I should not get the same figures in all the rows in a single column.