I think i've figured it out. i combined the two with a OR in between them and it seems to be working. Is this the correct way?

My syntax now looks like this:

MINUTES IS NOT NULL AND MINUTES='60' OR MINUTES IS NOT NULL AND MINUTES='30' AND DESCRIPTION NOT LIKE '%Test%'

Be careful with mixing AND and OR in the same statement without using brackets.

I would assume you want something like -

(MINUTES IS NOT NULL AND MINUTES='60')
OR
(MINUTES IS NOT NULL AND MINUTES='30' AND DESCRIPTION NOT LIKE '%Test%')

Because this is different and will return completely different results -

(MINUTES IS NOT NULL AND MINUTES='60' OR MINUTES IS NOT NULL)
AND
MINUTES='30' AND DESCRIPTION NOT LIKE '%Test%'

Using a mix of AND and OR in the same statement relies on them being interpreted in a specific order, and it's never clear just by looking at the statement how it's going to work.

It's like in maths, what is the result of -

3 + 5 * 2?

Depending on the order in which you make the calculations, the result is either 16 or 13.

Whereas using brackets, you can ask -

3 + (5 * 2)
or
(3 + 5) * 2

Likewise, make sure you always explicitly define what is being compared with AND and what is being compared with OR.

Thanks for your reply.

My original single statement is already within brackets because there is AND statements before and after it like this:

AND (MINUTES IS NOT NULL AND MINUTES='60' ) AND

so, to combine both, will it need to be like this:

AND ((MINUTES IS NOT NULL AND MINUTES='60') OR (MINUTES IS NOT NULL AND MINUTES='30' AND DESCRIPTION NOT LIKE '%Test%') ) AND

Do you really need MINUTES IS NOT NULL when you're also specifying an amount for minutes? Seems unnecessary and confusing - unless for some reason you're finding that you need it I'd get rid of it. In that case this would be a simpler version of your query:

AND ( MINUTES='60' OR ( MINUTES='30' AND DESCRIPTION NOT LIKE '%Test%' ) )