@Ashish KS There are various categories, individuals can apply namely Retail, sHNI and bHNI. Also, HNIs are referred as NIIs (Non Institutional Investors). There is min and max lots defined for sHNI (or sNIIs), similar to that for retail. Check following table of this very IPO. In oversubscribed issues, one should ideally bid for minimum lots as allotment is through lottery and it makes no sense to block more funds.
In SME IPOs, categories and allotment rules are different. Onlt two segments - Retail and HNIs and allotment is on proportionate basis besides lottery, hence more the lots, better chances of allotment there.
Hope it helps.