Business transfer by HUF to its member

Partial transfer not taxable...if full transfer then it's taxable...taxable as business income

It'll be treated as slump sale and short term capital gain will charged accordingly

As per section 50B, A trf of one or more undertaking (business) as a result of sale for lump sum consideration without being values being assigned to individual assets n liab on such sale.
we should consider the above scenario as Lump sum sale .
Gain on such sale depends on the period of holding by HUF.
If these assets is previously held by members and thn it is trf to HUF, ( it is not a taxable trf) .The period of Holding of members plus HUF is also be considered for computing the Gain