You can only (reliably) terminate one wire in a BIX insulation displacement (IDC) punch-down block, but you may sometimes need to bridge or parallel more jumpers (eg, Algo Auxbox's). One way is to build a "Loop Block" (also known as the "loopy, loopy thing").
BIX Loop Block
The image shows (3x) 4 pairs in parallel (bridged) by 3 wire loops.
Note: The loops are at the "rear", the cross-connects are at the "front", as normal.