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All amplitudes of $\\overline B\\to {\\bf B}_c(\\bf {\\bar 3_f}) \\overline {\\bf B}_c(\\bf { 3_f})$, ${\\bf B}_c(\\bf 6_f) \\overline {\\bf B}_c(\\bf { 3_f})$, ${\\bf B}_c(\\bf {\\bar 3_f}) \\overline {\\bf B}_c(\\bf {\\bar 6_f})$ and ${\\bf B}_c(\\bf 6_f) \\overline {\\bf B}_c(\\bf {\\bar 6_f})$ decays are decomposed topologically. SU(3) breaking effects on these amplitudes, depending on the position of the $s$-quark line, are modeled. 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All amplitudes of $\\overline B\\to {\\bf B}_c(\\bf {\\bar 3_f}) \\overline {\\bf B}_c(\\bf { 3_f})$, ${\\bf B}_c(\\bf 6_f) \\overline {\\bf B}_c(\\bf { 3_f})$, ${\\bf B}_c(\\bf {\\bar 3_f}) \\overline {\\bf B}_c(\\bf {\\bar 6_f})$ and ${\\bf B}_c(\\bf 6_f) \\overline {\\bf B}_c(\\bf {\\bar 6_f})$ decays are decomposed topologically. SU(3) breaking effects on these amplitudes, depending on the position of the $s$-quark line, are modeled. 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