The 别提有多…了 structure
The 别提有多…了 
structure emphasizes the superlative degree of an adjective.
This structure is often used in spoken language.
structure emphasizes the superlative degree of an adjective.
This structure is often used in spoken language.
Scheme
别提(有)多
adjective
了
Pay attention
有 can be omitted. The meaning does not change when omitted.
Examples
刚才买的那件衣服，别提多好看了
The clothes I just bought are very beautiful
gāngcái mǎi de nà jiàn yīfu, biétí duō hǎokàn le
听到爸爸的声音，他别提有多兴奋了
He was very excited when he heard his father’s voice
tīngdào bàba de shēngyīn, tā biétí yǒu duō xīngfèn le
我妈别提有多高兴了
My mother was very happy
wǒ mā biétí yǒu duō gāoxìng le