Glossary entry (derived from question below)
German term or phrase:
Kreditlinien zurückführen
English translation:
repay drawn portions of their credit lines
German term
United States
Top Quality Financial Translations
Native in: Italian 
Works in: German to Italian, English to Italian
Kreditlinien zurückführen
Proposed translations
Italy
Comprehension and Accuracy
Native in: German
Works in: German to English, Italian to English, English to German
repay drawn portions of their credit lines
40 years Engineer, 20 years translations
Native in: German
Works in: English to German, German to English, French to German, and 6 more.
restore or reduce credit lines (or facilities)
je nach weiterem Zusammenhang. Entweder wurde die Kreditlinie überschritten (der Dispositionskredit überzogen) oder teilweise oder vollständig ausgenutzt.
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Note added at 32 mins (2020-05-06 18:45:30 GMT)
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... bzw. ausgeschöpft.
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Esther Pugh
: oder pay off their LOC balance (yes, you can pay a balance, even in full; doesn't need to be in "installments")
2 mins
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You can pay off a credit, but not the credit line = Man kan einen Kredit tilgen (zurückzahlen), aber nicht die Kreditlinie.
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Ted Wozniak
: with reduce or repay, but not restore
33 mins
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Ok, reduce a credit line and repay the credit by installments.
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United Kingdom
25 years experience working bilingually
Native in: German (Variant: Germany)
Works in: English to German, German to English
reduce overdrafts
reset their drawn down credit lines
According to Duden:
"bewirken, dass sich etwas auf eine frühere Stufe zurückbewegt, einen früheren Zustand wieder erreicht"
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Note added at 2 days 43 mins (2020-05-08 18:56:17 GMT)
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For a little more dramatic effect, "rekindle" might also work for you....
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Note added at 2 days 52 mins (2020-05-08 19:05:06 GMT)
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"...the retailer’s strategy is to rekindle the proprietary credit lines that were a fixture of the company in early years..."
https://it.reuters.com/article/idUSKBN1WA2WK
Austria
Retd.T&I, Barrister & Austro-Advokat
Native in: English (Variants: British, Scottish) 
Works in: Spanish to English, English to Spanish, French to English, and 5 more.
to replenish (reinstate / recapitalise) their lines of credit drawn down
A line of credit (LOC) is an arrangement between a financial. The pool of available credit does not replenish after payments are made.
Replenishment of a Credit Card Line. Written by Brandy Bruyere, Vice President of Regulatory Compliance, NAFCU.
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