Query To Split Records Based On Values From Another Table?

I have a table with following values in a column

Table A

col1
10
35
20
25

I need to form a query which will take these four values in rownum part and split the records into 4 groups in Table B.

Table B- 90 records (10 + 35 + 20 + 25)

Now for example, the Table B is having emp no, order by ascending and i need to split into 4 groups,

with first group having start value -1 and end value -10

second group - start value -11 and end value-45

third group - start value -46 and end value -65

fourth group - start value - 66 and end value-90

one way i can do it by using union and count, which was a bit tedious if the no. of group goes upto 10.

note that the values in Table A is dynamically changing, so not able to hard code values.