כדי (כדי ש- / במטרה)

Make a later useful action possible

• An organiser asks for a contact number to send later updates.
• please请qǐngleave留下liú xiànumber电话diàn huà，so as to以便yǐ biànwe / us我们wǒ mencontact联系lián xìyou (polite)您nín。 — Leaving the number enables the intended contact.

Locate the pattern in real examples

• so as to以便yǐ biàn (so as to / in order to): please请qǐngleave留下liú xiànumber电话diàn huà,so as to以便yǐ biànwe / us我们wǒ mencontact联系lián xìyou (polite)您nín。; breakfast早点zǎo diǎnto set off出发chū fā,so as to以便yǐ biànto keep up with赶上gǎn shàng头班车tóu bān chē。
• Read the whole clause before choosing a translation. The examples show the pattern in use; the context below determines what the speaker claims.

Follow the speaker

please请qǐngleave留下liú xiànumber电话diàn huà，so as to以便yǐ biàncontact联系lián xì。

• In the opening situation: please请qǐngleave留下liú xiànumber电话diàn huà，so as to以便yǐ biànwe / us我们wǒ mencontact联系lián xìyou (polite)您nín。
• Leaving the number enables the intended contact.

Check the limit of the explanation

• so as to以便yǐ biàn states a purpose, not a completed result.
• Contrast in order to avoid以免yǐ miǎncontact联系lián xì不上bù shàngyou (polite)您nín, which names an unwanted failure the same action aims to prevent.

Repair the form before interpreting it

• The form please请qǐngleave留下liú xiànumber电话diàn huà，we / us我们wǒ mencontact联系lián xìyou (polite)您nínso as to以便yǐ biàn needs repair here. Write please请qǐngleave留下liú xiànumber电话diàn huà，so as to以便yǐ biànwe / us我们wǒ mencontact联系lián xìyou (polite)您nín instead; keep the word or frame in its demonstrated order.
• Form and meaning are separate checks. After the repair, explain the sentence in its situation rather than treating a familiar translation as a universal rule.

Keep the distinction

Read the full reference: HSK 6 grammar — Verb phrases.