To describe two-place physical problems, many possible models named Alice-Bob (AB) systems are proposed. To find and to solve these systems, the Parity (P), time reversal (T), charge conjugation (C), shifted-parity (Ps, parity with a shift), delayed time reversal (Td time reversal with a delay) and their possible combinations such as PT, PC etc. can be successively used. Especially, some special types of PTC group invariant multi-soliton solutions for the KdV-KP-Toda type, mKdV-sG type, NLS type and discrete H1 type AB systems are explicitly constructed.

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