How to merge multiple query results into one
Since the FROM, WHERE and GROUP BY clause are identical, combine them as follows:

SELECT
    prtner_name,
    COUNT(*)        shipment_count,
    SUM(inscan)     inscan_count,
    SUM(is_deliver) is_deliver_count,
    SUM(is_rto)     is_rto_count 
FROM tbl_shipment
WHERE  `awdno` !=  '' AND  `prtner_name` !=  ''
GROUP BY prtner_name;