Wow talk about sparse on details. It is hard to figure out what you are trying to do here. You really need to read up on normalization. You should NOT be storing multiple "parts" or values in a single column. This makes things far more difficult to work with.
Here is my guess based on your post:
declare @something table
(
SomeValue varchar(25)
)
insert @something
select '1.00001-Q1' union all
select '2.00100-Q2' union all
select '3.00005-Q4'
select max(cast(PARSENAME(REPLACE(SomeValue, '-', '.'), 2) as int))
from @something
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